Levator ani muscle is muscle around rectum and vagina, extending up to buttock. Warm sitz bath will help you three times a day. Anti-inflammatory analgesics like Motrin / Advil / Aleve are also beneficial with the narcotic analgesics. One has to sit on sorbo rubber ring for a while, so pressure on the tail bone does not occur while sitting. This will heal the inflammation of the tail bone and relieve the pain. The comprehensive treatment entails: 1) kegel exercisehttp://www.mayoclinic.com/health/kegel-exercises/WO00119
2) steroid injections, 3) Botulinum toxin injections4) sitting only on sorbo rubber ring (available over the counter at pharmacy)5) deep therapy modalities like electrical stimulation, interferential, short wave diathermy or ultrasound. These are done at physical therapy centers.
Please feel free for your follow up questions.
I would be happy to assist your further, if you need any more information.