Hi not very long ago my old cat was hit by a car,this left him with swelling on the brain,he kept having convulsions,which got quite bad and left him very disorionated and grumpy,unfortunatly he had to be pts.the vet put him on diazapam but he got so aggresive that i found it very hard to administer them.Is it possible that he could have been hit by a car?check to see if his claws are frayed/scuffed as this is a good sign.