swelling Vagina near Urethra

I am deperate, in severe 24/7 pain ! I have a pain and swelling near to urethra top of vagina one side, close to urethra= had this 3-4 years, it getting larger and worse. - nobody can seem to help. I get a spasmodic pain in groin bone which is related, I am 100% it is cyst. had vaginal repair unecessarily, gynaecologist mis diagnosed, now doctors don t want to investigate as it is close to urethra. Am so desperate I cannot tell you.
Have had various checks bladder okay ish. when I wee, I trickle after pls help 16.02.07
Janet