@aidan,
One time, when visiting a sister, we were in Ottawa, and I sat up all night reading, as we are sometimes wont to do, and when I got up, I was all stiff and sore but thought , ah, well, I'll be over it by breakfast. But I wasn't. It took about 2 weeks. In the meantime, I could barely walk, I was hunched over, shuffling like a 95 yr old, and in a great deal of pain. My sister offered me some Robaxacet (sp) which I refused, thinking it was a prescription for her. Needless to say, I was in a-gon-y. Mucho. Mucho. Mucho!!! Later, I wish I had taken that Robaxacet. There you go, though... pride, or whatever, goeth before a fall.