Adult-onset egg allergy - Please help

I've eaten eggs all my life, maybe too often. At age 42, I suddenly developed an intolerance to them (I got a slight tingly feeling in my mouth when I ate French Toast). I had this reaction with 2 separate batches of eggs, so I don't believe it was an issue of freshness.

Eggs were a favorite part of my diet and a good source of protein for me since I am mostly vegetarian.

Can anyone offer any helpful input for me? I would like to be able to tolerate eggs again. Is there a therapy for this? I have not eaten them now for almost 4 years.

Thanks to anyone who might comment.