last year i was pressured into starving yself with mt friend and i felt that i couldn't say no. she said that there was nothing wrong with it so i went along with this and we did exercise e.g. jogging everyday and both made our selves sick and had nothing to eat. later, another friend found out and put a stop to it. ever since, ive been experiencing stomach cramps, and shakes before and after i have even little portions of food to eat. I dont know what this is, and feel that if i dont eat it wont hurt. any advice what it is?