I am with you on the benefits of GH, however it seems to me that whatever I have read or heard about the benefits, they take a while to kick in.
As far as the injury itself, I couldn't tell you.
I hurt it the first time doing very heavy farmers walk pickups in the power rack. After I put the weight back down I had a severe chest pain and loss of breath. This spread to my neck, clavicle, front delt/shoulder and lat.
After seeing my ART guy, he informed me there is a muscle that runs in this direction, and I had most likely torn it to some degree.
However, this time, I heard and felt a "pop" in the exact same area, this time running with farmers handles. I'm more than a little sore this morning. Thanks for the advice so far guys.