I have an idea how you feel. I have ulcerative colitis and when i eat fruits or vegetables i get sick. So it makes it real hard to lose weight when all you can eat is protein an carbs. Even dairy products effect my stomach. I take a multi-vitamin to make up for it, but i have a hard time losing fat but no problem gaining muscles. I do cardio 4 times a week and light weight training 3 times a week. If you have any advice for me i would love to hear it.