Suggest Treatment For Lower Back Pain And Difficulty In Bending After Falling

i went snowboarding last monday and fell on my butt. it really hurt at the time, i couldnt move my legs, however after around 10 min i got right back up and went down the hill. i still cant bend down or squat down. my lower back hurts, my tailbone when i snese or try to sit. i cant keep pressure on it, i cant be sitting down for long periods of time. would you hav any idea what i hurt? maybe i pulled a muscle, fractured my pelvise or something