In response to concerns, my surgeon is quite aware of this problem, and they seem to think it is probably nerve pain from the cervical area.  On the other hand, I had a physical therapist here a couple days ago and he thinks one of my ribs is out of place.  He tried to fix that, but I am not sure it "took".

all of my doctors and nurses know of this issue; I have been complaining regularly.  If it isn't better next week we may make another trip to Ann Arbor to see what they say.