Open Question: back problems!!ouch!?

i think i just slept on it funny but my back has been killing me. my friend and i slept in this tiny bed and i had to sleep in a weird position. but normally my back would loosen up that day but its been 2 days and it still hurts like it did the morning when i slept funny. any ways i can make my back not hurt? please asap because i have practice today and in my sport i use my back and legs alot!!!! HELP!!!