My 11 year old cat bit me really hard on monday. now she wont eat and goes into

[JosephSclafani]

a deep sleep all day? I was playing with My cathe other night and she bit me and sunk her teeth into my arm monday night. I never seen her attack someone like that...she was fine the day after but today she slept in a hidden spot in my house for hours and didn't eat or drink anything...she always sleeps in different spots in the house during the day and never stays in one spot...she barley moved today and is going into really deep sleeps. She is normally very alert and she won't even react to really loud noises today...what is wrong with her?