P.
I can't believe someone else has this issue. I asked my ped and she had never heard of it, but said to avoid the yokes for a while longer.
The 1st time it happened was scrambled yoke with cheese, probably at the same age. And it came back with a vengance. I thought, maybe it was just too hard, having been mixed with the cheese. Two weeks later I made french toast with just yoke and I was wearing egg again. (the funniest part is that my husband came downstairs and made himself a scrabled egg just minutes after)
So, yes, you have a valid concern. But like I said, my ped had no answer. She said it wasn't an allergy, but must be some kind of intolerance. We waited a while (like 6 months) and then started letting her have things made with egg, like baked goods and waffles. Eventually we worked back up to whole eggs and she was fine.