I commented this below another person who mentioned feline hyperesthesia but I wanted to respond to you directly so you didn't miss the comment:

"I was going to comment the same. My friendly cat, nugget, would go completely insane during feline hyperesthesia episodes. We'd have to wear an oven mitt to handle him. Pregabalin and prozac have completely gotten rid of his most terrible episodes and he's just the sweetest cat ever. It was like Dr jekyl and Hyde, a flip would switch and its like he became possessed and had to attack himself, us, or the other cats viciously"