I haven't had any significant fat loss for almost a year :(

For reference, I am 20 years old, 144 lbs, 5"7 and my measurements are 34-29-37

I started out at 203 pounds, which I put on very rapidly with depression and emotional eating. 3 years ago I started the Medifast diet and lost the bulk of the weight that way in a little under a year, which I realized way too late was a mistake because I was only eating 800-1000 calories a day (damaged my metabolism) and not exercising at all (not toning in preparation for the loss). This got me down to 144 lbs. I am 5"7 and my measurements are 34-29-37. I fluctuate a good 5 pounds week to week and my measurements never budge by more than a few centimeters up or down.

But now, even after dropping my body fat % some by *increasing* my calories from 1,200 to a more reasonable 1,400-1,500, taking Spin and Zumba classes 3-4 days a week, 30 minutes of cardio the other two days, and weight training 2-3 days a week, my weight and body fat have not BUDGED. My arms and legs look decent, but I swear my enormous gut hasn't changed since I weighed 160!

If I suck it in it looks... flabby but average with a little pooch. If I am not vigilant about my posture it instantly adds about ten pounds to my frame.

I feel like I have gotten all the downsides of weight loss (sagging, ugly breasts and a slower metabolism) and none of the benefits (flatter tummy, more energy, etc.)

Here's where I am sure I go wrong: Recently I realized I nibble at a lot of the candy we have at work, but I added it into MFP and the calories they add are not unreasonable (the sugar limit just goes into the red, but I lost weight going over the sugar before)...? Also, last week I attended a big family event for a day and ate a LOT of sugar and refined carbs, which I rarely do, but could that really doom my efforts? This may be an obvious question to some of you, but considering I didn't know anything about heath a few years ago something like this confuses me!

Am I not pushing hard enough with weights? Am I under-eating? Overeating? Overexercising? Not enough protein/fats/carbs? I have no idea what to do at this point, other than keep cutting out refined sugars of course.

I feel like at 20 this shouldn't be so hard... I need all the help I can get. Please.