Eggs !

Yes!!

I'm fine with a really well cooked omelette but can't manage fried or boiled eggs which used to be my go to lunch.

Each time I've been pregnant I have been unable to stomach eggs but the last time I was pregnant was 30 years ago.

I can no longer eat eggs for breakfast. Hard boiled or an omelette is OK for lunch and I can eat fried or poached eggs for supper but definitely not the first meal of the day.

I wonder why this is after a lifetime of being able to eat eggs at any time?

Are you eating organic eggs or ordinary supermarket eggs?
My husband developed an aversion to eggs after Chemo but we now have our own small flock of 5 chickens and he can tolerate their eggs perfectly well. He particularly enjoys boiled eggs with a salad or as a sandwich filling.

I also seemed to develop an allergy to eggs when I was in my 60s. Especially for breakfast, they caused bloating and lots of gas.
Now I can manage one or two at lunchtime with no problems (I'll be 82 in a couple of weeks ) But daren't risk it in the evening.
We keep hens and they're laying well at the moment so the eggs are delicious.

It's not the eggs as such - so not physical - more a sudden psychological reaction.

Mine are farm eggs.

Could be the frying, not the eggs.
Reflux, liver disease, diverticulosis/isis could all cause revulsion or a reaction to anything fried.

Ever since I was pregnant the first time (50+ years) I have not been able to stand the smell of eggs first thing in the morning particularly boiled ones. Later in the day I am fine but my preferred way of cooking is poached.