back pain interscapular with chest tightness

I have had back pain between my shoulder blades for about three months. It is worse in the morning. I feel like I need to crack my thoracic spine or stretch it out. The chest pain seems to be limited to my sternum or breast bone. I have already had tests done to rule out cardiac involvment, besides it feels muscular-skeletal. Does this sound like a job for the back cracker??? I am a paramedic,lifting is part of my job and this is kicking my ass. What do you think?