Burning pain in bladder area mostly suggests some kind of infection and hence even if the tests are negative, it would be wise to finish a course of antibiotics. Another common reason that could be misled is a ureteric calculi and this can be identified by a USG examination of abdomen. If this doesnt help, may be a diagnostic cystoscopy
will be useful.
Hope I am able to solve your concerns. Thanks for posting your query in HCM.
Hope you get well soon.