Those symptoms sound more like some sort of RSI {repetitive strain injury} to me.
I don't know if PN causes that also??

What kind of work do you do?
office, desk, computer, assembly work, lots of reaching or detail work?
many other causes also, but these are the most prevalent.

I had "wrist strains" that evolved into forearm, then elbow then shoulder & neck pains & strains, so if any of that sounds familiar you might want to visit our Thoracic Outlet Syndrome forum or the RSI sub forum there.

http://neurotalk.psychcentral.com/forum24.html

be sure to look thru the useful sticky thread above the main postings list.

The first thing to do is pad your elbows with a kitchen towel or something and retrain yourself to sleep with arms more straight.
It takes a few days or maybe a week but it is doable.