Absolutely possible to develop quite severe allergies over time...

When I was younger, I used to be able to eat bananas without a problem, then slowly, I started to get an itchy throat after eating one, but could still eat things like banana cake... then I became itchy after doing that...

Now, it has got so severe that eating a piece of fruit that has been sitting against a banana can give me breathing issues, a teaspoon of ice cream that contains banana puree made me quite bad for several days - I hate to think what would happen if I ate a whole banana - I suspect it could be damn near fatal. I have similar issues with rockmelon. They are both fruits that I don't even touch.

If you suspect this is what's happening - then avoid peanuts at all costs, and possibly even get checked out by a doctor.

BW