I don't do well with high-density fats, either. I used to be much less tolerant, but these sorts of health things often come and go, and it's possible that in a few months you'll be doing better. It's hard to take that view when you're in the middle of a health crisis, but many of these issues get better with time, or your physicians figure something out.
Regards modest fat intake, I make hybrid gorp out of breakfast cereals and dried fruit. Personally I like Quaker Oatmeal Squares as the base cereal. Can you eat dried salted soy nuts to get some protein? If so, add those for some "salty" in your non-gorp.
Like you, I can only handle so much leaf tea. It can be pretty rough on an acid-intolerant system. However the powdered iced tea (which tastes sorta like sweet bread) doesn't seem very acidic.