Suggest Treatment For Pec Minor Pain And Tingling In Fingers

Male 37 with Pec Minor pain and tingleing in left pinky finger. My question is, ive had this dull bothering pain for almost 5 years now due to an injury. The pain seems to be occuring more often, and seems to be getting more severe. How do i control this pain and is there some type of Physical therapy that i can do to help. Streching the Pec Minor muscle seems to help the immediate pain but comes back within an hour. What else can be done? Dr has me taking 300m of gabapentin at night before bed and i thought this was helping but my pain has come back. any thoughts would be greatly appreciated.