I did post about this a few months ago. I had it at night when I was lying in bed. It would actually wake me up and i would move a bit and it would go away. I have changed PT in the last 3 months and it has calmed down.
I believe the PT was pushing me too hard the muscles were soooo tight pressing on the arteries more. I never had any numbness or blue arms/hands just the throbbing and PAIN.
Hope this helps.