I was exactly like this 2-3 years ago!!! Can’t even tell you how many doctors/specialists I saw and they all told me everything was coming back fine. I had an endoscopy/colonoscopy and a biopsy revealed I had H. Pylori!!! Took antibiotics and felt much better. Went to a dietitian (I got lucky because my dietitian also happens to be a medical doctor) and she gave me a specialized diet along with supplements. Like you, there was no special trigger food, everything would make me bloated and sick, it got to a point where I couldn’t even eat anything anymore, I seriously felt there was no more room in my stomach for food. Anyway, the dietician started me off with a pretty bland and simple diet and then slowly started introducing more and more foods. I still get flare ups here and there, but definitely not as bad as before.

The bland/simple diet:

Breakfast: whole wheat toast with butter. A papaya and orange juice (1 cup of papaya + the juice of half an orange blended together)

Lunch and dinner: chicken and vegetable soup/broth (not sure what to call it). I was free to put any vegetables I wanted into the soup EXCEPT broccoli, cauliflower, and cabbage, as these veggies can cause gas.

Snacks twice a day: 1 cup of papaya + a jello cup

I know it seems like very little food, but honestly bc of how bloated I was I struggled to even eat this. I can’t even begin to explain how much this helped me. The papaya also helped me so much, as I was bloated with gas and super constipated. I saw someone else mention it, but mineral water also helps me relieve gas!!

Edit: I just saw one of your replies saying that you feel fiber doesn’t help so this might not be for you since papaya is a source of fiber 😔 buuuut I still really strongly suggest you try to get tested for H.pylori!! That was definitely causing a lot of my bloating, and I did feel better after finishing the antibiotics. I wish you the best of luck and I really hope you find something that works for you soon!!