I'm having very similar problems, and the current diagnosis is a pinched nerve in the neck.
Right shoulder blade area sore all the time, both upper arms sore generally, neck stiff, pain down to hands occasionally. Had stabbing pain to left shoulder blade last week; that has gone now pain is on right and never stops. Can't sleep on either side.

Had physio and massage yesterday and got a bit of sleep last night, but still just as sore today. Have to avoid using right arm and using PC!

I don't get migraines, thankfully.
I used to, but since taking magnesium chloride they have stopped. Have a read about magnesium-it may well help you too.

I can't imagine my life if this problem persists. Being right handed and not being able to use that hand: no sleep, no hobbies, no use at all.