Prolapse can be caused by a drop in oestrogen. It can impact on sexual activity, bowel movements - 'common' means what? MayB ask for a referral to a specialist or a continence nurse for advice, B4 it becomes worse?
Sex can be done in many ways other than via penetration.

;-). Of course men want it but men have to be patient too! Lots of lube, patience and if necessary no penetration. Discussion is key.
If the 2nd/3rd samples were clear your GP was remiss in prescribing ABs. He/she should have cottoned on

.
If your GP isn't helpful, he should be able to refer you to a menopause clinic for which there are waiting lists.
Keep using the 'vagifem'. A steroid can thin the skin so don't know what the GP was thinking of

. Stick with the 'vagifem', every night for at least 3 weeks: some ladies require 2 at the same time occasionally: I use 'ovestin', if necessary 1 in the afternoon and the next at night then back to when required 4 my symptoms.