I hope your appointment went well, sorry I didn't see this sooner.
The last MRI was in '06, but sounds like stuff's been increasing. 2 years is a long time inbetween. If your insurance will pay for it, I'd get another one. Just to compare between the two and possibly give you peace of mind if nothing's changed.
My experience with the spinal MRI is that docs only order it initially if the clinical yields something worth investigating. Not 100% sure which symptoms call this to their attention. I know my neuro finally did it cause something made him go "hmmm."
Best of luck, no matter what.