Oy, my aching back

My back is killing me today. I lifted weights with my boys yesterday, and when I was doing my last set of squats I got a jolt in my lower back. Ever have that sensation in your lower back where you feel like if you just turn wrong just-a-little-bit that you're going to go down for the count? I'm there right now. Sitting down on the couch and working. I expect that to work. Oh, and six Advil so far today.