How to deal with misophonia?

I've had this disorder for just about as long as I can remember, but I never knew it's name until looking through a list on Wikipedia a few months ago. I can't simply avoid my triggers, as much as I wish I could.

My brother smacks, no matter what he eats, be it a granola bar, an orange, cereal.. and GOD the slurping! It makes me so irritated, and just thinking about it makes me want to cry. He breathes like a deep sea diver and when I'm trying to do work at the coffee table since I don't have a desk, he just lingers into the kitchen, breathing, smacking. It is so, so irritating and it ruins my good moods. Telling him to stop doesn't work, as he either ignores me or continues to do it louder.. basic older brother behavior. Then there's texting.

The annoying 'takka takka' of a smartphone keyboard.. God, it just really annoys me. I can't stand it. And the way my mother eats just..

This is really unpleasant, and any tips or pointers would be really, very appreciated.