What Causes Spams And Pain In The Pelvic Region?

Lifted something very heavy woke up May23rd with severe pain in my perieum and then a few days later pain never stopped, I get severe rectal spasms. Now my rectum has been removed so I am fearful. I am almost 6 weeks into this mess and muscle spasms continue every day and night and I had an MRI showed L4L5 annular tear. I'm wanting to know if the scar tissue is causing the muscle spasms in the private parts or the injury itself. How many weeks can the body continue to have muscle spasms constantly without damaging my muscles? Skelaxin is not doing anything, I have a stomach that bleeds and I need to figure out how to handle this pain. thanks Lana