Recurring yeast infections

I deal with right now recurring vaginal yeast infections.
In the years past I've health with chronic uti and chronic bv infections.
I've had three treated this year so far(yeast)
I did take antibiotics for a bv infection, which I also took Diflucan with also, I do this any time I take antibiotics because they always cause yeast.
Treated a month ago, given 3 Diflucan to take every 3 days.
I did feel better.
Yesterday went back to gyno and tested positive for yeast infection.
I am not diabetic. I do not swim or been having sexual activities. No perfumes, lotions or douching. I do not have any stds. I wear loose clothing and typically no underwear. I shower daily with fragrance free bodywash. I use fragrance free detergent and nothing else. I can't eat yogurt because of stomach, dairy issue. I eat pretty healthy.
I've tried creams otc and rx, boric acid suppositories, just about everything.
I do take birth control pills, don't drink or smoke and maybe take antibiotics twice a year.

This gyno said "other" options are very expensive and could culture the yeast but that usually doesn't help much. I want to get another opinion but it's hard where I live.
I've done everything, the diet, the keeping it dry and clean, everything I've known so far.
Anyone with any advice on this would be amazing. Thank you!