Can someone help? I have some bad back and chest pain.

I was having band rehearsal earlier today and I bent over to adjust an amp and i got stuck. My girlfriend had to literally pull me straight. This happened 5 pm and the pain s over whelming. The pain is right in the middle of my chest and goes around like a circle. I can’t afford to see a doctor so I have been lying down all day. Can anyone give me any advice to try and make this pain stop at least?