There are many things that can cause this pain but it could be chronic cystitis or interstitial cystitis. The symptoms are the same and a good urologist can help diagnosis the problems. Either way you pain, burning and bladder pain. The self help things etc. can help you while you see a diagnosis!
We have an IC support forum here on this site actually two, listed below. There is actually an article on the physical relationship on the first forum. I am also an IC support group leader and director of MOARK IC. If you need more info or some links feel free to pm me.
You might want to consider a referral to a pelvic pain PT. They are often able to rule out and pelvic issues, muscular etc. that doctor's are not trained to look for.
http://www.medhelp.org/forums/Interstitial-Cystitis-IC--Pelvic-Pain-Support-Forum/show/412
The expert forum where you can actually ask the doctor here on Medhelp is here also:
http://www.medhelp.org/forums/Interstitial-Cystitis-/show/264
Hope this helps!
Shelly