I don't have CRPS but I do have pelvic pain and it does affect my bladder and bowel.
I actually have a disc bulge in L4/5 and S1 but they say its not bad.
But one day I had the most god awful pain in my front side and thought I was having female issues.
Went to the gyn and he felt around in there and pressed on a spot and was like is this it. I almost jumped off the table. I was like yes - what is it...an ovarian cyst a finroid, something worse. He was like ummm nope its a muscle spasm.
I had a spasmed levator ani which is apparently pretty common in women with pelvic pain.
I went to a special physical therpist that helped me with it that included external stretching and massage and internal stretching and massage
It will not go away until you really work hard at retraining those muscles.
There is a really good book you can get written by the standford docs called A Headache in the Pelvis. Stanford holds week long seminars on how to corrct these issues but they wont get better if you dont do the exercises.
Hope that helps. Not sure its the same thing but its worth looking into. I was very surprised.