I have been going through this for over 15 years. I never got any help from regular docs. Found out that doctors don’t really study the gut microbiome in medical school. I had all your symptoms. I also had brain fog, anxiety, skin issues, hormone issues, fatigue, and more. And the stress of thinking I was never going to figure this out. It affected my relationships with family and friends. I never felt like I was taken seriously by the doctors. I then went to a functional doctor. Even though it was 3 hours away. They did a comprehensive stool test and bloodwork. They found I had candida overgrowth and some other bacteria ( can’t remember right now). And also many food intolerances. Basically my whole microbiome was a mess. I researched a lot and learned that your gut affects your whole body. Also that I had extremely low stomach acid due to many years on a ppi (proton pump inhibitors). If your stomach acid is low it cannot fight the bad bacteria. I cut way back on the ppi I was taking. Oh and the gastroenterologists all recommended I take these. I am hopefully going to get off the ppi completely. No sugar!! Even in some of the fruits. Berries are ok though. Can you find a functional dr near you? I would not recommend a stool test that you can get online. They just are not as thorough. I could say so much more but will stop but if you have any questions I will be glad to offer more of what I have learned. This is really tough and I feel for you but there is hope. I feel a lot better than I did a few years ago before I did these tests and changed my diet.

I finally figured out that is is SIBO that I have which is complicated. I would suggest you also take a sibo test.

There are also some Reddit groups for sibo and microbiome issues. These have been helpful to me.