Yesterday I was doing shrugs with the little shrug machine at the gym. I was getting lazy and I started using bad form, and all of a sudden I got this sharp pain in my back. It's about 8 inches down from my neck and it feels like it's on the right side of my spine. I've had pain there before from doing shrugs like an idiot, and forgot about it, and yesterday it hurt pretty bad. What do you think I did? I hope I didn't like slip a disc or something.