Give it a week, if it is not gone, go see a doc.
When I had ran into a back injury, it took me 2 and a half months. it sucked i remember sitting at lunch with coworkers laughed at a joke then couldn't even get up off my seat for a good 5 mins. Doc said it was a small muscle somewhere in my mid center of my back which is easy to pull, and gave me some flexrill (sp?).
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I just injured myself the EXACT same way with regards to the symptoms. I got some flexeril, and vicoden from the doc. Tore a ligament in my lower back. Doc said 7-10 days to heal... wait a couple weeks before resuming full fledged. its been about 4 days now and the pain all but gone at the moment and things are looking up. I will resume at least cardio tomorrow.
The Historic PES Legend
..could be a pinched nerve,..... I have felt similar pain plenty of times doing Deads in the past, which puts me on the ground and I am fine after the w/o, and the next day. I have contributed it to horrible form back in the HS days using a hex bar for deads. There is no popping, or extreme pain, but more a sharp quick pain that surprises the hell out of you,... similar to having cramped hamstring and having to stretch the leg out immediately. So I would think it is a pinched nerve, or a strain as others have stated.
Quick update. It was feeling better so I went for a run the other day and had a really good tri workout. It is really stiff and the pain moved from a centered area to my right side. Hurts to bend over and what not. Going to make an appointment with doc ASAP.