Hi, Welcome to Health care magic forum.
It appears that you have followed an un planned procedure, with vast diet restriction, which make the stomach ,raw and there is less interest over the food.
I advise you to try medically, means approach a physician, he may prescribe injections of anabolic
steroids periodically, and enzymes
omeprazole, and
domperidone etc.
Take more of calories,fats, oily foods, meat, chicken, and sea foods.
Try to sleep, for more time, practice early to bed and late to rise, try to sleep in the afternoon, for a moment.
Wishing for a quick and complete recovery.Thank you.