DO NOT work out till you see a doc! Serious bro. I gotta a bad back, to make a long story short Im a fireman and I was at a fire and fell through a floor. it really hurt but it wasnt untill a week later did i feel its effects. I was at work and i had to be loaded up and taken to the ER. turns out i pulled a disk in my lower back. Some symptoms include pain and tingling in your legs or toes. Not something to be taken lightly PLEASE take my advice, if you can get an MRI but get looked at once. Just to rule it out. The good thing is with todays technology it can be handled with physical therapy or steroids. (not the ones your thinking either). but who knows it might just be a simple sprain but then again...dont make the same mistake I did, im 23yrs old and sometimes I feel like im 70, all because I didnt wanna go to the doctor.