I am new to the forum, but dealt with this for quite some time. My PT helped me release the pec minor at the armpit/shoulder and it helped. This was not a comfortable process....not sure I would try it yourself. Maybe go for a good Mysofacial release massage. Doorway stretch to release the pec also helps. You need to do this a few times a day. Hot bath....for tightness. Ice for spasm.