Your boss sounds just awful! I wish you didn't have to deal with him. You're brave to go back to work and face him.

Those feelings are some of my worst triggers. I get really mad--crying mad, which is embarrassing.

Affirmations work for me. Turquoisesea's advice would be a good one: "I don't have to accept what other people say as the truth." One that helps me is "I do not need approval or attention to be okay." I have a list I use in a crisis.

When I worked in customer service, I also made tally marks of things that really bothered me. It helped me see the bad times as separate incidents/behaviors that I could learn to work around. Before, I felt like it was bad all the time; that was overwhelming. Maybe you could do that with your boss's behavior.