Ahhhhh! That's terrible, I've been there. Go really easy on animal fats, I'm not sure about olive oil, peanut butter, and the like, it's been a decades since I had to deal with it. I'd definitely avoid hydrogenated vegetable oils and margarine. Also, they probably should have given you an antibiotic, but that wasn't known when I went through it.
Good luck, comrade! It will suck for six months or a year, but with proper choices in what you send down your gullet, full healing is possible!