I suffer from bladder problems. I had them as a baby, so off and on all through out my life, I have battled cystitis. I suffer from IC. Please do not take the word of the dr. that you do not have an infection if you are burning and having to go frequently to the bathroom........and you only dribble.
With IC, you have an infection within the wall of the bladder due to the tiny microscopic pinholes in the lining of the bladder. The infection is trapped within the walls of the bladder and it will only show up as a miniscule amount of bacteria on the dip stick testing.
I suffered many years with IC before the dr. diagnosed me. One military dr. told me that he thought that I need to go to the psych dr. because I was going to the ER too often with only a little bit of infection.............as if it were a 'cry for help'............yep it was a CRY FOR HELP........I was burning and going out of my mine from the spasms.........but like many male drs. he was blowing off my symptoms
I found that using certain cleaning agents bring on the spasms. (either by touching the chemicals or breathing the fumes.) With IC, caffeine can cause the spasms, so can spicey hot foods or things with vinegar like mustard or bar b que sauces in my case.
I have celiac disease, and IC goes along with that........it is in the immune problems along with the fibro.
My dr. said that many drs. will only give you some loopy meds to do the testing for IC, but because I was so sensitive to the spasms that it would be torture and she did the test while I was under general anest. having a laporscopy for female issues.
I have sense had a bladder tac and thankfully my IC is calmed down for now. I do occasionally get flare ups and I self medicate (with macrodantin and the oxybutin to calm the spasms.) If that doesn't work, then I know to seek my dr. out for more testing.
I hope that you find out what is causing the trouble.
You might find if you are taking any medications in the aspirin family (advil, anti inflammatories) this can also bring on spasms in some people. (I also had trouble when my husband was on those medications.) I also found if my husband was on antibiotics that I was allergic to that it brought about another round of infections.