Arm pain

I had a PM inserion (left side) just a little over a year ago for complete heart block.  After 6 weeks of limited range of motion (ROM) for the  arm (per drs. orders), I develped frozen shoulder syndrome.  I went to a massage therapist and she helped me with the majority of the pain and ROM.  I still have pain in my arm and now  I believe that this is due to the PM hitting up against nerve/nerves.  The PM is underneath the skin.  Has anyone else experienced this?  I have consulted my Cardiologist that inserted the PM and he indicated that the PM should be moved to go under the mucle.