Hi K.,
I have had the same problem. I actually started having muscle spasms while still pregnant towards the end. I had them intensely the first few weeks after delivery. I still have them on occasion, but I had assumed they would go away since having the baby...sigh My baby is 5 months old now and I also had a C-section.
I am currently seeing a pain specialist for fibromyalgia and when I talk to her next I am going to bring this up. In the meantime I would strongly recommend you see a good chiropractor. I can recommend Tim Peterson. I believe he is in the northwest, possibly Cedar Park or Leander. I am not exactly sure where he is practicing at the moment, as he left his old practice, but he is an excellent doctor. I think with a little searching you could find him.
He is wonderful with patient care and even children's adjustments. I am doing extensive work with the pain doctor's office or I would be looking for him myself. I think a couple of adjustments would do you wonders and I may go back to chiropractic once I have been given a plan by my pain specialist office. I just don't want to confuse healing modalities. I am supposed be receiving Physical Therapy as well, so it would be hard to see which treatment was doing the best.
Pinched nerves from spinal compression during and after birth can definitely cause muscle spasms. If you see improvement with adjustments you most likely will only need a few weeks of treatments before you are good as new. I would also tell you that a good massage therapist, with natal/pregnancy training would be another really good thing to include if you can find a good person.
Hope this helps!
D. ;)