They did not stop. Honestly I'm only making a guess that I was hit because I really don't know. I have a fleeting memory that a vehicle was approaching me from behind (because of the noise) prior to when I went down. The truck (white with yellow hazard flashers and an unknown logo) was going away from me when I got up and looked down the road. Given the timing, that's the only assumption I can make. I have no damage to myself or my bike to tell how I went down, only that I did. A little love-tap to the rear tire perhaps?
This is the EXACT reason I have my rear view mirror, eventhough I don't like how it looks on my bike. I have had some CLOSE CALLS, I don't trust drivers, and I need to see what's approaching behind me.
Glad your OK David...they were probably on the cell phone and didn't realize what happened.