I have a constant pressure on my bladder i have had all sorts of tests to rule out possibilities and it is not a uti what could it be ?

Unclear, but: If all bladder eval is normal, i would think of unusual things like endometriosis if you are a female or uterine fibroid. Also, an empiric trial of Azithromycin is worth doing due to poss atypical infection like chlamydia and ureaplasma whether a man or woman especially if sexually active. An eval by gyn is advisable if female. I forwarded your question to urology for input and suggestions too.