I don't really know what that means either, but I get the sense that he means not just burying it or setting it aside because you know it's unreasonable, but trying to figure out the roots of why you're so angry. I don't know though, I'm just making things up.
Mostly I'm just sorry you're feeling this way

. When my grandmother died I was really angry. Like, REALLY angry, all the time, at everyone, for everything. The day before the funeral my husband ate the last banana, which I had been planning to eat. I flipped. the hell. out. I was YELLING.
And for several weeks afterward I was just sort of on a hair trigger. Everything made me angry. It made me angry to be on the bus with people having stupid conversations. It made me angry when a classmate of mine checked wikipedia for something I already knew the answer to, because she didn't believe me. It made me angry any time anyone argued with me. It made me angry when people laughed together while I was out buying a dress for the wake. I knew it wasn't like me to be so angry. But if I really tried to follow the thread of anger that kept running through everything, it really seemed that I was angry that someone who truly loved me unconditionally was taken away from me, and instead I was left with all this stupidity, all the stupid arguments people start for no reason when life is so short, all the damn people on the subway pushing and shoving when MY GRANDMOTHER WAS DEAD and wasn't going to see my wedding and all these morons got the breathe the air that she wasn't breathing anymore.
I wonder if that's what he means. Just getting to the bottom of it.
I'm sorry you're suffering so much