A friend had recurring UTIs until a urologist suggested D-mannose six months ago. Not one UTI since. D-mannose richest source is cranberries. But take the concentrated capsule or other form. It's worth a try?

I have IBS stemming from sugar consumption. It's taken me years to narrow it down to the culprit. But before I lowered my sugar intake I stayed on heavy doses of probiotics. It helped tremendously to triple the dose recommended. I finally spoke to a very knowledgeable dietician who confirmed that it wasn't harmful to me. She did say that DRs usually didn't tell their clients about pre and probiotics because they weren't drugs, just supplements. That was years ago and since then there is a much better understanding of them. My druggist keeps hers in the fridge and tells me that the kind that are most like food are the best.
I'm sorry you've had so many UTIs. I've never had one. My parents would get them however. They drank alcohol daily for many years and they also got kidney stones and gout. I've never had those problems either. I don't drink except at parties when I go to the beach once a year. I've often wondered if a record of drinking caused their internal bacteria issues. They didn't drink the last couple of years of their lives but I feel like the damage was done. I hope you find a way to avoid the UTIs. That sounds very hard to deal with. Much care to you, Sara