auch !!!

just now i was in rush, so i run into my car to move it as i blocked ppl's way out from parking lot.
unfortunately, i hit my buttock accidentally towards the door.
AUCHHH !!!! it's painful
The effect of pain still last until now after few hours gone ....
how?? what should i do?
no massage as it's pain when touched -_-lll
cold compress? no ice available in house +_+
left Arnica comp. gel. hopefully it will works asap