I need help with recovering my bladder

I’m looking for medication suggestions when visiting my primary doctor. I’ve been completely sober since October.

My doctor has tried oxybutyn I’ve also tried restricted diet and physical therapy.

I haven’t had any accidents but sometimes I’m using the bathroom every 15 minutes randomly. When I get the sensation of having to pee I’ve got less than 5 minutes to find a toilet I try my hardest to hold it for as long as I can but the pain gets so bad i has me crying and embarrassing enough I’ve had to pull over and pee outside a few times. At this point I feel pretty defeated. Someone please help.