Back is messed up

I don't know what I did or how I did it, but my back is messed up again.  Not as bad as it was a couple of years ago, but close.  I can walk better now than then, but not much.  I was talking to Debbie on the phone while I was at the office.  I was leaning back in my chair and after we finished talking, I got out of the chair.  My back was tight on the right side.  It has gotten worse each day.  Glad this doesn't happen often.  It ain't fun!