Definitely don’t put this down to turning 30, what you’re experiencing isn’t normal.

Chips and soda seem like they might aggravate an acidic stomach but if it’s working okay. How about soups/purees?

When my dad thought he had an ulcer many years ago he ended up eating jarred baby food, it actually turned out to be appendicitis so he was fine once they took it out. But if you’ve had a gastroscopy they’ll have checked that out.