my personal opinion is that when you are dealing with something that could possibly be life-threatening, then you really need to get tests done. That way you know what's going on, or what's not going on.
Pretty weird how an allergy like that could come on so suddenly.
One suggestion that I have is that when you do find a food you like and seem to tolerate, don't overdo it. You might've been just fine if you had only eaten one egg every day. But 6 to 8 eggs? Probably too much for your system to handle
Moderation, or as the Taoists say... the middle path