OH NO! Glad you are ok!
I had to laugh at the visual of Pouncer! They are so funny when they get their hackles up!!
I'm not real sure but falling down the stairs may be easier on you than a party with seven 14 year old girls!!!
A good hot shower is in order and maybe a heating pad. Hopefully tomorrow you will be as good as new!!
btw- Happy Birthday to your Daughter and I hope she has a wonderful party!!