I'm sorry to hear this...I wish more women would have the courage to walk away from a hair appointment going bad..it's your hair and your body, and anyone that is causing pain, tell them to stop, if they refuse, as your stylist did, to take the braids out, just leave....don't worry about what you look like walking out the door..
I think you already did the right thing by going to the doctor. Your scalp has to heal, that's where the damage is. Very gently massage the bald spots to stimulate blood flow in your scalp..your hair still looks healthy, scalp just needs some extra TLC..