Best probiotics??

I have been treated with antibiotics 9 (yes nine!!) times this year for diff things (UTI, PID, surgery, sinus infection, an STI, ugh!) And my body is so out of whack obviously. I get recurrent itchiness and burning down there and stomach issues. What are the best probiotics to help this?? My doctors can’t seem to fighre out what’s causing the vaginal problems so I assume it’s from a bacterial imbalance.