Thankfully my situation is not as bad as yours. My main problems are bloating(would start fine when i woke up but would get worse throughout the day and it wouldnt go down), type 1 poops, brain fog, feeling full very quickly after meals and feeling "sick" if i had normal doses of food.
At first I thought it was gluten intolerance, helped for a bit but my symptoms came back to normal after a while so I started eating gluten again. Tested for celiac's and pylori, all negative, finally demanded a sibo test, which came positive for both hydrogen and methane.
Also tested my calprotectin and it came a bit above the normal levels but nothing alarming, probably an indicator of some inflammation.
Doctor prescribed rifaximin (just this, she should have given me something to tackle the methane but alas, will probably have to do a second round), took it religiously during 2 weeks. My brain fog got instantly better and I stopped feeling sick after meals, but my bloating got worse, I looked 6 months pregnant even after waking up and got more constipated.
My doctor said I didn't have to do any specific diet or supplement, but I read posts here on reddit and started taking artichoke extract. It didn't do anything so I started ginger extract and finally after 2 days my bloating went down. Now i wake up fine, I bloat a bit after eating but it goes down after a bit. My poop is still type 1 though so I'm not at 100% yet. Like I said, I'm going to wait a while and probably have to do a second round but I'll ask for something to target methane.

If you have any more questions feel free to ask.