Sounds like you have an exceptionally brilliant vet. NOT! There is something wrong with your cat and now that you mention all the aggression, I'm definitely thinking there is something neurologically wrong with your kitty. How is this not something your vet could come up with? Cats are not normally aggressive, however, they can become aggressive when the world around them becomes aggressive. Are you chasing or yelling at him? I know you are tired of this problem, but many times owners are the cause of it! Seriously!

Please contact a bengal rescue group in your area. Unless you are prepared to put the kitty through multiple tests with a specialist to determine what is wrong so it can be dealt with, the cat needs to find another home. Like I mentioned, if the problem is strictly behavioral, a new home environment may solve the problem. If the problem is neurological, only medication can help. This is clearly a situation where you're not happy and your bengal is not happy.

Sending him out to a farm will end his life rather quickly and I find it heartless that you want to even consider this when there are other avenues that might help this kitty. However, this is YOUR cat and I'm only offering advice. I commend you for having tolerated this for so long and I know you're at your wits end. You're free to do what you want, but please consider the needs of your kitty.