Please help me! My cat is very very sick?!?

this sounds like what happen to my dog 2 years ago she was acting just like that for 2 weeks and then one day she died i am so sorry but i think its time for your cat to go. but you can still creamate her witch means you bring her to the vet(once she has died)and the people will burn her then they will but her ashes in a nice little box for you to keep.