I have pain between my shoulder blades, any advice?

It could be any number of things but sounds most like a muscle related issue. As long as you don't have any numbness or tingling in your arms you probably don't need to rush to the docs. It's probably a postural and muscle weakness related injury that is aggravated by certain things. First off (don't roll your eyes) if it hurts, don't do it, secondly you need to be doing some scapular (shoulder blade) strengthening exercises which really should be taught to you by a Physical Therapist. This type of pain can usually be eliminated by addressing the underlying weaknesses.