I know what you mean! It's like during pregnancy you already had a restrictive diet. After birth you thought it's over...but it isn't!
Well, actually i ate whatever i wanted when i was BFing. But tried to stay away from peanuts (in case baby was allergic) and veggies that might give baby gas. That was about it.
Since your baby might be allergic, just hang in there a couple more months! Good job choosing to BF!