How do you know if you’ve “thrown” your back out? I can’t move without crying, I think I pulled a muscle yesterday in my back and today I tried to have sex, and it was hurting my back so he stopped and I tried to get dressed and as soon as I tried to put my shirt on my back locked up and I started crying hysterically. All I could do is lay down and cry until he came back from downstairs to help me do I need to go to the ER?