SDRL, I know you probably already know this, but this is serious. I'm slipping a lot too right now, and it IS hard. Have you been able to talk to someone about this, like your T or counselor? Sounds like it is turning into full-blown anorexicia, which, since I've been/am both bulimic and anorexic, I know is hard to get over. One thing that I've heard helps is settin alarms and at each alarm, eat something small, like a package of peanut butter crackers, or something with protein in it. It should help, and in the meanwhile do try to get some professional help. I'm probably not in the best shape to be giving advice in, but this is all I've got.
Many hugs and good wishes