how are things going with the cat now? there is a feliway plug in diffusser too, and I use it from time to time, when one of my cats are stressed about something or a couple of them are not getting along temporarily.

I have never heard of a cat acting like this before, cornered you for 6 hours? yikes! I would definately consult a vet to see if there is a mental or physical problem and then consult a cat behavorist. does you cat drink water...he's not avoiding water is he? is the cat aggressive all the time or just at certain times?