Hi Joel -
Sounds great. If you are having any pain at all, I would not exercise the arm and/or shoulder. I got a ride home shortly after I was injured. I did drive to the ER, and we went on a road trip the next day - but I did not use my arm or shoulder for several weeks; actually after I saw the orthopedist.
One thing I should mention is that I did not wait to start exercising. In my opinion, exercise is the most important part of staying healthy.
Instead of riding, I walked on a treadmill for an hour at a time.
I started riding again at six weeks.
Given that you subjected your arm and/or shoulder to further stress, I would hold off exercising that arm and/or shoulder until it feels better.
I also broke one or more ribs. But that seemed to heal after about a week or so. I am several years younger than you (65 at the time of the injury), so I may heal a little bit faster.
I recommend plenty of rest, lots of water, good food and lots of low impact aerobic exercise - not on the bike.
If you want, feel free to respond directly to me. We can exchange as much info as you want and/or you can call me if necessary.
Regards,
Corwin