Pantera? Sins? ;--)
Glad you checked in mon! Take'r easy, we'll be here.
We all know kookie stuff like this can happen almost unprovoked, with just a weird motion or lean or lifting something.
Agreed of course, as we age we have to respect our limits. But more importantly imo anyway,, stretch every day. Which I'll bet you do anyway. Even if we don't exercise. I find that a few simple stretches in the morning do worlds toward feeling good and keeping outta 'trouble' .
Feel better. I expect you back in the saddle before long.