I feel bad you had to go threw that. I would call your old "new" dentist and tell him you have an emergency. They should take you in right away. Dentists always leave room for emergencies. You shouldn't fast after such a cleaning. You body needs to deal with all that bacteria released into your system. All hygenists are not as evil as that one. NEVER go back to her again!
I am on my way to the dentist for root canal...hope my experience is better then yours! Wish me luck and feel better soon...don't wait for that emergency appointment!