What should I do when I have severe dull aching pain behind my right shoulder blade. MRI says it's swelling but I've had it for 2 1/2 yrs.
See a doctor and get treated. Two and a half years a long time, if it hasn't healed by now it won't. It will only get worse unless you get treated. In the meantime, try not to strain it. Use the hand when you absolutely have to.