Hi gerrigirl
I danced for 20 yrs or so too ... Ballet like you ... went back to it once or twice but it is history now, except for flitting around a little at home. I wasn't aware of the damage it can do to pelvic floor muscles. I have had spinal surgery not so long ago and the condition i had was also aggravated by ballet.
I have had 2 children ... the last one 22 yrs ago ... there is a condition in which the uterus falls forward and puts pressure on other 'bits' ... that can be corrected by surgery, especially successful with people under 50yrs ... maybe ask your GP for a referral to a specialist who can test to see if that is part of the problem
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