1. If you are comfortable (except for the pain) in sitting cross legged or squatting with full movements in your hip, then probably there wont be any bony injury
. In that case the brusing in your butt will be a haematoma
2. Muscle cramps
in your back and neck can be due to soft-tissue injury after the event.
3. Ice over the bruise
will decrease further formation of haematoma and swelling.
4. Massaging might increase the pain-spasm cycle and worsen your condition. Hot fomentation near the most spastic areas will give some relief.
5. Taking NSAID's with muscle relaxants along with adequate rest to the part will help you recover better.
Get well soon