Hi I know the feeling I too have had many test done, I thought I had utis all the time, but the test kept coming up neg, I was told that I could have innercystial cystitis, I went to a urologist I a cystoscopic done, everything came back neg, the cause of my pressure and constant urinating is due to nerve damage in my back due to a motor vehicle accident, any way if you have cystitis, or innercystial cystitis, it can not be detected by any test except for a cystoscopic, in which they put a catheter into your bladder and a scope, I dont know what type of test you have done, but if you keep having these feelings and you havent seen a urologist, maybe you should. Good luck, if you have any other questions, pm oe email me, id be glad to offer you some more insight on the cystoscopic,