With your doctor out of town , is there a partner or another dr covering for him?

It could be an inflammation of some kind so if you can't find a RSD/CRPS knowledgeable dr , then at least the urgent care, or another dr of your choice just for a basic follow up, then if needed look for a more advanced dr for treatment.

It could be PN ,you might post/read on our PN forum also for input.
http://neurotalk.psychcentral.com/forum20.html

Is there any heat or swelling, or just the pain.
But a basic check would be good. RSD/CRPS usually isn't widely known about, so most likely the front staff wouldn't know what it was , unless they have pts with it already.
I don't know what kind of time frame it is , but I do know some have had to chase a dx for years , it's getting better but just depends on the dr and how updated he stays. I would estimate weeks to a couple months but not sure at all.