HI Paulina ,
Just having frequency of urination doesn't mean you have interstitial cystitis.It is a altogether a different condition.It usually presents with pain in the bladder
region with minimal amounts of urine
and sense of relief on emptying it.So the person goes to the toilet again and again to empty the bladder to get relief.
This is not the case here.It is pure frequency you are having with some discomfort in the genital region.
In most probability it is an urine infection which failed to get detected on tests.Other causes could be stress/ anxiety induced frequency, stones in the bladder or overactive bladder.
You can continue the Cipro and pyridium.You can repeat the urine test just to confirm that we didn't miss the infection.
If the symptoms persist even after full course of Cipro , then you should go for ultrasound of the abdomen to rule out any gynecological issues.Sometimes heavy uterus and ovaries can press on the bladder and cause the frequency.It will also detect any stones too.
Interstitial cystitis is a very rare diagnosis and only considered when all other conditions have been ruled out.
Just try some cranberry juice and continue the medications.
I hope this will help you settle down the anxiety you are facing .