I am really glad to know that you finally overcame the injury and I am surprised that the route towards recovery was so much similar to mine.
In my case, it wasn't due to the service action in tennis but snowboarding. So, that story is due and I may write a similar one in the near future.
Nice message for those seeking some motivation.
RE: Tennis Rotator Cuff Atrophy: A Degenerative Injury That I Overcame with Physical Exercise