Confused about my bladder issues

Last month an Arnp told me I have a severely prolapsed bladder and needed surgery. Somehow nothing was done from that apt. So I scheduled another w the actual Dr. Yesterday he said it's not prolapsed at all. It is very mobile, it moves right back up. No issue except I always have 2 pee, I see everyone's toilet. so he's giving me meds and sonogram. He said in future if it persists I can get surgery. I have an overactive bladder. So what is that? I still am confused. Bladder is normally mobile but mine is super mobile. I guess enough 4a tech 2 think it's prolapsed. Does this have a name? How did this happen? Why now am I having issues w it? I do have allot of back issues that cud cause urinary and renal issues. And had a baby 3yrs ago at 39yrs old and bladder infection my whole life and kidney issues as a child.