I really feel for you in this, as I used to be bullied at work too. I guess going my route of finally fronting up to the thug and telling him that if he didn't leave me alone there wouldn't be enough of him left to fill a crisp bag never mind a body bag isn't an option for you.
Seriously, though, NO-ONE should have to suffer bullying. I would try to keep a log from now on of everything said or done by this nasty piece of work. I presume you still have any e mails as evidence? And is there any possibility of recording any calls from him too?
As for things back-firing on you................if you are sacked, or forced out of your job that is unfair dismissal, and is actionable. It will be seen that you have reported a problem, and then been dismissed.................pretty conclusive evidence if it comes to court action.
