OK, so, another kick to the plums was apparently in order.
X-ray revealed degenerative disc disease of the L5-S1. That's why I have lower back pain quite a bit and why long drives leave me worse for wear.
Annnd, just for s#$ts and giggles, they saw a large calcium deposit but can't tell if it's in my kidney or not...but I'll say not because I have no symptoms at all of kidney stones. But to "be on the safe side" I have to get an ultrasound and blood test tomorrow...hope I'm not pregnant!