The problem is that the more you try to control your feelings the emotions become more and more uncontrollable, basically feeling can not be controlled because it happens naturally, just like animal instinct, when we see something we immediately guessed (suspect), when something happen we immediately feel, even our minds are sometimes also difficult to control and easily manipulated, for example if I say "do not imagine rabbit" what appears on your head now? Rabbit is not it?
I think you can get numb on emotions. But since emotions are something pretty basic behavior in our life, its impossible to drop them.
You can achieve something with meditating, but completely lose it? I doubt thats possible.