Soozie,i had this exact thing a few weeks ago,i think you might need moreABs, i had a course of 3 which didnt do anything,i eventually rang 111 and they had a Dr speak to me and faxed another prescription through to my chemist, it was a weekend and the Drs surgery was shut,i was in so much pain, and felt like you,a heavy feeling low down ,as if my bladder would burst,
Then i was given HRT and vagifem which has made a difference
I think you should go back to your Drs or even outpatients, which i was advised to do,
I am sure with another course of ABs it should clear
It wont be cancer,its all to do with the menopause,