My wife has had pain on her back under her left shoulder blade and causes her to wake up at night while she's sleeping on her back. When she moves to sleep on her stomach the pain goes away. Whenever her back is against something she feels the pain, so in the middle of the night she feels the pain a lot until she turns on her stomach.
The pain follows the heartbeat and is a pounding/burning pain over a medium size area.
It started a year and a half ago everyone once in a while, now it's happening ever night. The x-ray didn't show anything.
Last night it was very minor compared to other nights though. It's off and on.