Amy,
I have to really work at keeping my right shoulder (side of surgery) up level with the left one. I have to make a conscientous effort to lift it - if I don't think about it or am really tired, it sags 2-3 inches also. I too have the indention in the armpit - makes it impossible to shave - have to use Nair - of course John doesn't have the same concerns in that area! Just another one of those little changes! I work with that arm daily just by raising it as high as I can for as long as I can. Sometimes I have to support it with my left hand to keep it in the air very long. I also do some curls with 2-pound weights. I make myself use it when I'm putting dishes in the cabinet etc. It is stiff sometimes and weak but not as much as it used to be. Dr. S told me to keep moving it so I have tried to follow that advice - any little bit helps.
Pam