Many years ago, I had symptoms of IBS for several weeks. I was perplexed. My doctor (GP) suggested I add more fiber, which didn't help.
I used probiotics for a few days, and my symptoms resolved immediately. I no longer had daily IBS symptoms (and still don't). So, needless to say, that was really a best case scenario.
Having said that, I don't know why... but none of us appear to have gut symptom issues (despite some of my kids being on long term abx years). I do struggle with systemic yeast issues though (I knocked it back but I'm sure I'd still be positive when I retest again).
Kid#1: Extremely sick for several years, very difficult to treat, but doing great now!
Kid#2: Still sick now despite being treated for years but doing better (not well yet).
Kid#3: Generally good but relapsing off/on.
Me: Adv Labs positive 2016 (suspected I passed to my kids)-not as sick as others, mostly battling fatigue and yeast issues (heart/kidney issues resolved)
Treating with herbals now.