WHAT IS WRONG WITH ME? HELP!

I am starting to think something is very wrong with me. I am going to have my hormones checked in the next few weeks. I am posting hoping someone out there can give me some guidance, or has an idea about what could be my problem.

I seem to be gaining weight for no reason, and am unable to lose it.

I am 5'5 F and weighed around 125 my entire life (from ages 13-29). I literally never fluctuated except for the occasional "oh I have a vacation/party/wedding coming up and want to drop 5-10". My body never gained weight. In fact I would call it weight gain resistant

At around age 29 I gained about 15lbs over the summer. Quite honestly, I'd been over indulging a bit but not enough to where I expected have gained 15lbs...I would have expected under 10. I began dieting but my weight continued to climb and leveled off at about 155 (another 10lbs) for about a year. Then, out of nowhere, in the matter of a couple months, I gained an additional 10lbs.Putting me right at about 165. Nothing made sense. My activity/exercise level hadnt changed, the amount of food I was consuming hadnt changed. I continued to diet. A year later, I am up another 10lbs.

Here is what I've experienced If you have any insights please please please share:

Symptoms
1. Dizzy+ vertigo when restricting calories even in minor amounts. I used to be able to live happily off 1200 calories, now 1700 feels like starvation and am unable to function.
2. Marked weight gain when restricting grains & bread
3. Marked gain when consuming red meat
4. very sensitive to restaurant/processed foods and sodium (major bloating immediately following that can last for days regardless of water consumption)
5. Major increase in appeite when exercising or not enough energy to exercise if dieting
6. Feeling awful during/following cardio at any level (multiple trainers and techiniques)- mostly dizziness
7. no longer able to fast for 36hours. (I used to liquid fast 36hrs/week, usually Monday's. I did this for 15 years steadily and always felt great. My body loved it and craved it. I even had energy to exercise heavily on fasting days. No longer able to fast, let alone miss a meal)
8. No longer able to go long periods without food (used to only eat one meal a day and used energy from that meal all day long with no issues).
9. No apparent issue with soy/dairy/wheat/gluten.
10. Do not get full without grains in diet
11. Eggs do not satisfy and feel gross after eating them, also do not seem to lose weight when replacing meat with eggs/eggwhites
12.Smoked from age 17-23, quit cold turkey, gained no weight but experienced temporary acne
13 never been able to drink alcohol. tastes like poison. feel sick after drinking.
14. lifelong allergy to certain mushrooms- results in vomiting.



Constants
Drink at least 64 oz of water a day sometimes double
Take fiber supplement everyday
Never drink alcohol
Never overeat to the point of stuffedness

Diets I have tried & results
1. VEGAN (no fried foods) 1month
Felt great first 2 weeks, then in wks 3-4 lack of energy/dizziness/weak/tired
Lost 5lbs

2.ATKINS INDUCTION (prepared own food) 1month
Felt awful, like I was going to die.
EXTREME Dizzy/sweaty/tired/unable to function
Lost no weight- maintained

3. PALEO 6months
Maintained at first, then gained 10lbs
felt hungry most of the time

4. CALORIE RESTRICTION 1500CALS/DAY 3months
VERY low energy/couldnt function/dizzy
Lost no weight

5. "EATING CLEAN"/MEDITERRANEAN DIET (no processed foods/whole foods/no flour)
Gained 5lbs
Felt ok, NOT good
Tired