What to eat??

My diet has been pretty restricted (at least in my opinion, when compared to what it had been previously) since about a month and a half after Gavin was born. I figured out by trial and error that any dairy product or any food with even a tiny amount of dairy in it (including any amount of whey) makes Gavin's stomach very gassy. I'm pretty sure chocolate (even in fairly small quantities) and cabbage do the same thing. Other foods I've quit eating but am not completely sure yet if they actually cause him to have an upset stomach are peanuts, broccoli, cauliflower and very acidic foods, like tomato sauce and citrus fruits. In addition, I have been trying to avoid large quantities of soy for my own benefit. In my opinion, that constitutes a significantly restricted diet, especially because I used to eat milk, yogurt and often some type of cheese every day. But the most annoying part, I think, is that I have to read every ingredient on every label to make sure there's no non-fat milk powder, whey protein, butter, etc. , and you'd be surprised at how many things that eliminates, especially the easy ones that are low-fat and have protein! My Trader Joe's chewable vitamins, for instance, have non-fat milk powder in them. Wisecrackers are made with buttermilk. Most margarine contains whey (and I think margarine is nasty anyway). It's really hard to make a quick quesadilla without cheese. Peanut butter and jelly sandwiches are out. I can't grab a yogurt for a quick snack. Nix on almost all baked goods other than plain bread (and sometimes not even that). Can't do pasta with tomato sauce or cream-based sauce. I also have a preference for low-fat items that are minimally processed but don't take a lot of preparation time, and I need to be eating more protein. So, any suggestions??