I am a 5' 2" 17 year old girl that has been experiencing unexplained weight loss for around 6 months. I weighed around 105lbs. at my heaviest and now currently weigh around 85lbs. I have an appetite and am consuming over 2,000 calories a day but cannot seem to gain an ounce. I also have progressive weakness and muscle fatigue and I feel cold all the time. My other symptoms include hair loss, salt craving/taste loss?, severe constipation, sleep disturbances, abdominal pain and nausea. My blood pressure is consistently low at around 80/50. After running tests at my local hospital I discovered my thyroid hormones were lower but within range, both my am and pm cortisol were very elevated and my zinc was low but within range. All other blood work checked out normal. I currently take an oral contraceptive and am on no other medications. Does anyone have an idea as to what this could be?