Looses the senses and stops responding.

Doctor, My father stops responding and loses his senses suddenly yesterday, this kind of situation is arise in 2,3 months back we didn't get it that it could get so serious, as that time he was taken to emergency there doctor given him some sort of injection then it was fine. But suddenly we saw he is losing his appetite, he is not able to speak or express himself, he even forgets where is his bed, washroom where he has to go, he even don't know how to operate tv he was kept holding the tv remote wrongly and when I corrected it but still don't know what to do with this, he repeats only few things that I need to pee, I want to do vomit but he does nothing , yesterday he was not even able to differentiate between the big object and small object he was putting big object in smaller one. He is looking at watch , asking same questions repeatedly. He is also facing problem in sleep now today he is lost he is not ans simple math even yes no he didn't know about pee,hunger, et