OP, good luck. I would encourage you to work on your mental health during the gap year. Also, just a reaction but isn’t doing a training program a red flag for someone with a history of eating disorders? We nearly lost a family friend to anorexia and one of the big signals was excessive attention to food ( her’s was cooking everything to control things), others had excessive attention to exercise. Just hope this is something your doctor is on board with for you to be doing. Wishing you the best. It was really really generous of Amherst to extend the offer for you. I hope your gap year proves to be a great launching pad for your future.