Hello, I'm a healthy 22 year old female with no history of STI/STDs. Twice recently, however, after intercourse I obtained what I thought to be a UTI. Bladder/lower abdominal discomfort, frequent urges to urinate (but often unable to actually to do so, or very little would come out), burning at the opening of the urethra when peeing, etc. I have had UTIs before, so I figured this was what it was, and went to my doctor for antibiotics. However, I was told that there was no sign of any bacteria in my urine sample, even after culturing it (along with no STDs, no pregnancy, and all those other commonly assumed causes when a 22 year old sexually active female is involved in just about anything in the medical community). They gave me antibiotics anyway, since i was in extreme discomfort, along with some pill resembling AZO (over the counter bladder numb-er). I took the full course, but the discomfort did not go away for another week or so. When I tried to have sex again, nearly a month later, this happened all over again. I've never experienced anything like this before, and I'm really at quite a loss. It's upsetting and certainly disrupts and affects my quality of life. What could this possibly be?