Lower Back Pain

This morning at work, my back started to hurt. I'm not entirely sure what started it since it wasn't bad in the start. It got progressively worse during the day. It hurts when I bend and do some other movements at the waist. It hurts for the first few seconds walking then subsides. It also hurts a bit when I go up or down stairs. I was thinking of delaying going to the doctor until tomorrow since it all seemed bearable. Until a few minutes ago, that is. I was having dinner and was sitting for a while. I also was pretty full. When I was done, it was very hard to stand up. It also hurt a lot more when taking steps. It was then I decided that maybe I should go to the doctor or hospital tonight. Mean tried calling the number of Health Links Manitoba since she saw their ad on TV. They could probably advise us on what to do since the waits at hospitals are extremely long unless it's a huge emergency (our doctor was gone for the day and the waits are pretty long there too). Lee, the nurse, asked me a bunch of the usual questions when trying to see what's wrong. She advised me to see how it if it subsides in the next 2-3 days and go to the doctor if it doesn't subside. Of course she said I should see a doctor soon if it gets much worse. In any case, I'm going tomorrow. By now, the pain decreased and it wasn't so hard to walk but it was still worse than the rest of the day. I would imagine it's pretty hard to diagnose lower back pain since there are a lot of probable causes and a lot of the symptoms are the same. I just hope this isn't anything serious. I'd be pretty depressed if Mean had to do even the heavy lifting here.