Pain between the shoulder

I have pain bewteen the shoulder blades. I haave been to chiro: Manuplated; Is there any supplements I could take to help the recovery or any exercises to help with this injury. I have pain that radiates down the right arm. Thinking about using some type of EMS.

Any help would be greatly appreciated.

possably the Traps are either too tight or too weak??
Try using a lat pull down bar, on the seated row machine. or wide grip bent over rows?
on the contraction, really force them shoulder blades together

Also try bent over dumbell laterals for the rear shoulder area.

Try calcium magniusium tabs
Bromelian tabs (spelling??) extract from pineapple