Horrible stomach pains from eggs?

This never use to be an issue when I was little, although I was never particularly fond of eggs I always loooved french toast. And now about (4years ago) eggs make me sick! I don't ever get any skin rashes, or anything aside from pain in my stomach (just below my sternum no lower than my belly button) I don't ever get heart burn from consuming them, but I do feel like I need to burp a lot to relieve pain and I feel like I if I could throw up (which sometimes I've done) I'd feel better. But the kicker is it's only certain times do I feel sick from eggs, tonight I cooked french toast and now about 4 hours after eating it I am doubled over in pain. However the other day I had a breakfast sandwich from mcdonalds (there 'eggs' never make me sick) But I can eat things that have egg in them, like cake or and cooked food similar to. However I can NEVER eat actual scrambled eggs thats just a nightmare for me the pain usually subsides after napping although sometimes I'm so uncomfortable I can't get to that point. I don't know what it is, I looked at egg allergies but it suggests other symptoms, and not being able to consume foods with eggs in them.