There is a general rule in allergy/intolerance medicine...

People are often intolerant, and crave the very things they cannot
tolerate biologically. Doctors will use this rule when interviewing you to determine testing directions to take.

I do have some GI intolerance issues with nightshades...chili peppers especially. And green/red peppers. But the potatoes cause terrible burning in my feet, and no GI intolerance.
I don't eat eggplant very often. But I seem to have problems with
paprika at times too. If I avoid them all, my life is so much simpler, and comfortable. I can tolerate a little tomato but not every day or large amounts. (one of those large Rachel Ray tomato salads would do me in).