So, I need to find a way to rejuvenate my metabolism.

First off, congrats on getting past some of your over-dieting problems! It's great that you're looking at doing this the right way, the healthy way

Are you in college? That makes it both easier and harder to get in your physical activity. Do you walk a lot? That's a great easy thing you can do, just walking between classes and things, and it's something that has disappeared as an adult for a lot of people (me) who left college to get a desk job. The second thing is that hopefully you have opportunities to join some sort of club or activity, something physical (even if it's not too strenuous). Then you're planning around it, it's already part of your schedule, not trying to squeeze in an extra workout between study sessions or whatever. Basically, everyone under the sun is busy, you just have to make room. You can become skinny without exercise, but you probably won't like your body that way (and exercise keeps you healthy, anyway).

I would say keep at a small deficit and exercise as much as reasonably possible, and just give it time. Health issues just make things more complicated - hopefully you have a doctor you can talk to about the best things you can do

One more thing that comes to mind. If you're really 19 (as it says in your profile), have you considered that you're still kind of settling into your adult body? On top of everything else, it's pretty likely that scrawny-younger-teenager-you is an unrealistic weight goal for adult-you-plus-hips-and-things. I don't see your height in your post, but around 140 is a pretty healthy weight for an average woman. You could be adding extra stress on yourself just by setting goals that maybe don't make realistic sense. Don't beat yourself up over it! And good luck!

. I can hardly stand to eat as much as I feel like I do, so what am I doing wrong? Can someone please help?

What is your age and height? What is your calorie goal?

I am currently 19, almost 20, and I am 5 foot 3.5 inches tall. My calorific goal is, as recommended by most of these sites, 1200 per day. It used to be 1500 per day.

how much did you put down to lose a week? if it isnt allready put down 1lb or 1/2lb lose per week.

TDEE is total daily energy expenditure. That is your BMR, the amount you need for normal organ function, plus all of the energy you need for everything else throughout the day, and working out.

Okay, this is going to get a bit lengthy, so be prepared! Lol, but i hope this makes sense and helps in the long run....
Alright, well I have also dealt with the same problems with weight loss. It took me about half a year to realize what i was doing wrong, and then another half of a year to realize that nutrition is EVERYTHING. I can not stress that enough. Yes your amount calories do have a large roll in weight loss or weight gain but its what you eat that really makes all the difference.
I understand that you're in school and exercise is always a hard mission to accomplish, but I have good news! It is very possible to lose weight without working out, Have you ever heard of the term "abs are made in the kitchen" or "exercise is 20%, diet is 80% " If you are eating clean healthy foods, you can lay around all day and not have to worry about exercise. Of course, exercise is what speeds up the process to lose weight, but you can always fit exercise in at least 3-4 times per week.
Now, I know you're probably thinking to yourself "well, what if I'm on the run and I can't prepare myself a healthy meal?" This is were dedication comes in...preparing meals is a BIG big help with that. On the days you prepare a meal at home, or even on the weekends, you can always prepare more food than usual and have it set aside to finish for the rest of the week. Thats what I do. I usually make larger amounts of foods and eat my desired amount, and then set the rest in the fridge to finish the next day. When your prepared, you don't have to result in unhealthy eating! (And don't forget, if you don't buy unhealthy foods to put in your cabinet, you wont eat unhealthy foods!)
One thing I have also learned is not to be afraid of fat! Now I'm not talking about the fat we get at McDonalds, I'm talking about avacados, fish fats, and nuts or natural nut butters, (I prefer looking at ingredient labels and making sure that they do not include sugar or oil as one of the listed ingredients..my favorite kind is Krema Natural Crunchy Peanut Butter, it has no sodium and only 2 grams of sugar, which is from the peanuts, because the only ingredient is peanuts!) These kinds of fats are what help your body to perform certain functions in order to meet your body's natural needs. This can be researched some more over google, if it's a bit confusing. But when I upped my fat intake, I noticed more weight loss, so depending on your fat intake, i would suggest upping that just a little bit!
One thing I would like to state is your BMR - Basic Metabolic Rate. Im sure you know this rate does not mean these are the amount of calories you eat a day to lose weight. This is merely an estimate of the calories your body needs to function properly. But along with moving around to and from work, and other daily activities you may perform, this number will go up. For example, my BMR is around 1400 calories..I exercise daily, therefore I up my calorie intake to about 1500-1600 calories. The body needs food to be able to fuel it with energy and perform natural functions. When we workout, our body has to use that fuel to supply us with energy that we need. Now what about our body? It needs fuel for itself too, right? Well when you don't eat enough calories to fuel your body, this is what causes you to be constantly exhausted and energy-less. This also causes your body to go into starvation mode, which is when whatever calories you give it, it's going to be stored as fat that way it may supply itself if it is ever to go into starvation mode again, which results in a slow metabolism. This is why we need to make sure we eat our daily amount of calories so this does not happen.
This is when nutrition comes into play. Fruits vegetables and lean meats and healthy fats are what supply your body with the healthy fuel it needs because they include carbs, protein and fat. Yes a burger at McDonalds has carbs, protein and fat, but these are all highly processed and chemicalized foods. There is no nutritional value behind their carbs protein and fat, except for, well, fat. Chemicals is not what you want to be putting into your blood stream...not saying you eat Mcdonalds or anything. Im just trying to prove the fact that we truly are what we eat. What you put into your body's blood stream for energy, is what your going to get back from it as energy.
Sleep is one thing that is also VERY VERY important. When we sleep, we allow our bodies to rest and fuel up for the next days work. Sleep is a huge critical factor when it comes to losing weight.
Another thing I have learned is that we need to love our bodies. We all have our imperfections, but these imperfections make us who we are. Our bodies is what keeps us alive and keeps us moving. Even when we're tired, it still does what it can to get us from one place to another. The body is a crazy working machine and we should cherish is and supply it with goods foods as reward for all it does for us. I hope this helps and if you have any questions or need me to clearify on something, please feel free to ask!

TDEE is total daily energy expenditure. That is your BMR, the amount you need for normal organ function, plus all of the energy you need for everything else throughout the day, and working out.

Logging accurately over a period of time will give you a good idea of TDEE.

I am 5'4" and 213 pounds, 38 years old, and have a desk job with less than 30 minutes of exercise, 3x a week, and my TDEE is 2500 calories.