Malfunctioning gall bladder?
Hiatal hernia. I've had it for at least a couple of decades. When I asked my doctor what a hiatal hernia was, he said there's a hole in my diaphragm and my stomach is trying to push up into my chest.

There's only supposed to be a small hole for your esophagus to go through but mine's too big or my diaphragm is too weak. I used to have heartburn and acid reflux a lot. My doctor told me not to eat anything greasy or spicy. Yeah, right.

I can eat anything I want to, as long as I don't eat too much and I don't lay down for awhile. Tomato sauce is my kryptonite. It gives me heartburn if I have too much, but if I eat 2 or 3 raw tomatoes at a time it doesn't even bother me. I don't know why.
I just looked online and one of the possible causes of a hiatal hernia is lifting heavy objects. When I was a teenager or pre-teen I was stronger than I am now. I grabbed hold of the front bumper of a Honda Civic and lifted it up. I wasn't sure if it came off the ground or not, but one of friends said the front wheels came right off the ground. Another time I put my butt against the left rear fender of a Datsun 240Z, grabbed the edge of the wheel opening with both hands, lifted and pushed, and slid the back of the car over. It moved about a foot and a half IIRC. That hurt my hands so bad I never tried it again. I wouldn't even try it with gloves on. If something else stupid I was doing when I was in elementary school didn't strain my diaphragm, I think that would have done it.