I've had some lower back pain for about 2.5 weeks now. I think I hurt it while training (it started after my squat day), but I never felt anything "snap" or "give" while I was training, it just started hurting one day. The pain is very specific, located just over my upper sacrum, only on the left. It doesn't spread anywhere, and it's a burning pain. The actual muscle in my lower back doesn't hurt.
It hurts most often when I'm sitting down, but I could also feel it sometimes when I extend my lower back.
Immediately after the injury, I stopped lifting for a few days and iced it. I tried lifting a few times after that (no deadlifts or squats), but I could really feel it when I tightened my back for overhead press, and when I reached up for the pull-up bar.
After that I went to the trainer at my school, and they told me to take a week off of lifting entirely, and to continue icing. I've done that now, and the pain remains. I'm going back to the trainer in the next few days, but I was wondering if anybody had any experience with pain in this area? I'd feel a lot better if I knew what I'd injured.