Megestrol for weight gain

I am 21 years old, 6'2 tall and weigh only 115lbs. before my crazy flare up i was 145lbs which is still underweight considering my height but I would at least like to get back to my previous weight of 145lbs or more. I try eating more but I am vegetarian and i don't think i get enough calories, I get full by eating small meals, I had pancreatitis 2 months back which made me lose more weight. I have heard that Megestrol is a prescription medication used for anorexia and to increase appetite in elderly patients. I wanted to discuss it with my GI to see if he thinks I can use it to increase my appetite and gain weight. I look so skinny because of my height and I am embarrassed to go out as cloths don't fit me anymore and I look like skeletal. Any suggestion or ideas?

Synthetic progesterone - maybe just ask for androgens since your male.