I've had a voice for almost 15 years now, since I turned 28. When it started it was just a voice and could do very little other then speak. It uses very few words "mostly curse words" in an attempt to keep my attention. But it learns from me and uses these things against me. Now it mostly pushes emotions onto me to get me agitated. And once I become agitated it begins shaking me, the more agitated the more severe the shaking. It's enough to knock me off balance at times.

The best thing I've found is keeping busy and out of my own mind. Or a minor mantra and controlling my emotions when I can not be active, which it always tries to change. If I have time a 10 minute Om chant "meditation" seems to weaken the voices.

Mantra "still working on it"
It, lies and deceives
It will hurt everything I care about if I allow it.
It offers nothing but lies and deception.
There is nothing to gain from listening, as it offers no facts.

It doesn't block it out entirely, but I find I listen to it less often and it's words carry less weight. Another thing that helps is to forgive it for what it's doing. Apologize for anything you may have done to antagonize it and try to share a warm feeling of love. Again it's only temporary, but it is a very relaxing feeling. I know it's difficult to forgive something that wants to harm you, but try it and see what happens. It may help, if not you will at least gain better control over your emotions by practicing.