Need some advice! What would you do?

I am a 51 year old male triathlete. Experienced shoulder pain and after 2nd episode of shoulder being very stiff (i.e. could barely touch my chin with right hand), I sought medical assistance. X-Rays taken and was referred to an orthopedic surgeon. Ortho indicated that I had arthiritis of the A/C Joint, 2 bone spurs on the Acromion, and calcium deposits. Seems like I am at a Stage II Impingement Syndrome.

I am / was training for an Ironman event, but this might sideline me for a while. What would you do? Try physical therapy or push for a procedure that will relieve pain/and increase room in the shoulder to assist in eliminating the impingement?

Thanks!