Has a urine sample been sent to a Lab for testing or R the surgery diagnosing in a dipstick test? If +ive 3 days ain't enough, one should be prescribed 7 days of the appropriate Anti biotic.
Vaginal atrophy mimics repeated urine infection-type symptoms really really well. Use the vagirux from tonight, for at least 2-3 weeks which will ease symptoms and begin replacing any oestrogen within the vagina. If that doesn't help, ask to change to Vagifem or estriol/ovestin. Let us know how you get on?