Jess,

Have you checked into pelvic floor PT? I had or have the same thing you are speaking of due to lumbar/sacral spinal issues and a broken tailbone. And, oh, yeah, chronic constipation makes this 100 times worse. I thought originally it was a pudendal nerve deal but it wasn't. My problem was the Levator Ani but PT (two different times) helped considerably. I understand what you mean by controlling it on a daily basis. The specialized PT's teach you how to control it.

And I am going to agree with Mrs. D. about the biking. I bought a Recumbent Bike to help with my knee pain. The darn thing is the more I used it the more I couldn't even sit on the thing. I found out later from the Urogyn that that and even Kegel exercises were the very worst things I could do at that point in time. Anyway, the darn thing sits there now and I need to sell it. One last thing though...my Urogyn told me to get the nerves calmed down first before going into PT and I did that...had injections in the spine and in the tailbone blocking the ganglion impar. That helped and THEN I was able to proceed with PT. I haven't had any sit pain since then EXCEPT I will feel a twinge in the tailbone every now and then but that's about it.

So, to make a long story short...yep, the nerve damage causes spasms and you can get those spasms just as you would in your shoulders, etc.