Stupid back pain...

I don't know exactly how, but I did something to my lower back earlier this week and haven't done any exercise since Wednesday morning when I walked on an incline for 40 minutes. My back was already hurting by then, so I know that wasn't it... It feels kind of like a combination between a strained muscle and some kind of nerve thing. I'm happen to already have an appointment with my doctor tomorrow for a physical, so I'll ask him about it. If he doesn't have anything for me, I'll go see my chiropractor.