I tried fasting, a few days eating nothing and drinking only water with a bit of salt. It doesn't really work. The bacteria go into hibernation mode until you start eating again.
I don't drink milk anymore and I tried a low FODMAP diet. The latter helped, but I found it so hard to keep up and it was stressful.
I had every diagnostic under the sun. Chest xrays, stool samples, hydrogen methane breath tests (hydrogen positive). I am 99% convinced it was all caused by stress and the antibiotics I took was the straw that broke the camels back.
Stress triggers flight or fight mode. Chronic stress means you're always in this state which means your body isn't producing the digestive enzymes and stomach acid it needs to maintain correct bacteria levels since you don't need to digest food when you're being chased by a metaphorical tiger, better use that energy to run away instead.
The only probiotic I haven't tried that I would like to try is Symprove which is a refrigerated one that was recommended to me by quite a few pharmacists.
Once I am fully confident my stress levels are very low and I've learnt to manage them I will start to wean off the supplements and see if I get a recurrence of symptoms. I'm not yet fully cured but most importantly I'm on the right track.
In my IBS journey I had a period where I had very strong histamine intolerance, and vitamin C (in the form of QBC vitamin, quercetin + bromelain + vitamin C) really helped stabilize me. Histamine intolerance often led to chronic insomnia, my heart just would not calm down at night.
In my research trying to help myself I've come to the conclusion that histamine intolerance is really more of a symptom of a larger issue. It seems to suggest SIBO or any other sort of inflammatory process in the small intestine. Reason being that dysbiosis (of which SIBO is just one sort) has multiple synergizing effects: not only that often the bacteria associated with dysbiosis will produce lots of histamine through fermentation activity (there's a certain klebsiella type I've seen implicated) but also the dysbiosis causes a cascade of issues that degrades the gut lining which increases the amount of dietary histamine that crosses into the body.
Otherwise I've seen histamine intolerance also suggestive of Crohn's, etc. where the gut lining is chronically damaged.
Like you said wine often reveals it for people, also vinegar, aged cheese, meat or seafood. It's funny that now that I know what to look for I notice when eating with people when they get a stuffy nose right after eating that stuff.
Probiotics didn't help either. Even the refrigerated ones.
Then I started drinking a half cup of unflavoured gelatin before each meal. Take half a tablespoon of the powdered gelatin, mix with half cup water, wait two minutes to dissolve a bit, down the hatch. It's helped like 75% of the way there.
Also, I started taking anxiety meds because my stomach issues get more triggered when I go out and it's early days but that may help.