Tears came to my eyes as I read the responses that you all posted.....I am so happy there is somewhere to bounce these ideas around.
Here are some more details about Dewi.....
I am the ONLY person who can pick him up and when I do he becomes very stiff with his paws striaght out. Holding him in just a slightly wrong way can get my eyes scratched out!
Cutting his nails is not an option for me..... even three or four people need to hold him down when he is at the vet.
He will sit on my lap once in a while (very rare) when he is very tired) and this is also the ONLY time he likes to be petted....usually this is not an option, he will bite and swat at you if you try.
Very often Dewi will get into a spaz and his ears go back and his eyes widen and he attacks everything in his path.....it is sometimes amuzing to watch, but it also disturbs the whole house. He attacks his brothers (Mozart, Sebastian and Dusty - all cats) and because of his medical problems he hits every wall and obstacle in his way...he could possible really hurt himself.
If he tries to run up the stairs (which are carpeted-thank God!) he needs his claws to grip with because I think he has depth perseption problems and sometimes he falls right off backwards, again possibly hurting himself!
I know you are only hearing the very bad qualities of Dewi, but he is also a very good boy sometimes too.... he is so sweet and he doesn't know that he is hurting others; I am sure he doesn't mean it.
He loves snacks....in fact it is a way I can control him. All I have to say is "Dewi.....want some snacks?" and no matter where he is or who he is attacking at the moment he runs in with his little stumble and devours them!
Although I want to medicate him, I do not want him to loose his boyish charm!!

I wanted to post his picture for you...but I cannot figure out how to do that...sorry. J