My back seized up after a run two weeks ago and never really recovered. I had to wrestle someone at work a week ago (a legitimate part of my job - honest) and it aggravated my back again. It seemed to be getting better, but suddenly today, I can't stand up straight and I can't walk comfortably. The pain is on the spine, in my lower back and occasionally all the surrounding muscles go into spasm. Should I see if it improves over the next couple of days (before I'm back at work) or should I bother my GP?