What Causes Burning In The Vagina?

I have this feeling that my vagina is burning, I also have a problem with the the bladder it feels a if I have a hold in it. have been to the doctor and she send me to do a urodynamics bladder test, but everything was normal, I have been suffering with this problem for 4 years. I had two operations in less that a year .
Cervical disk replacement and another in my shoulder .
I also experience some bleeding no long ago i also , so I'm due for an endoscopy and colonoscopy.
Hope you can help me
Thank you