I'm working on it with more or less success depending on what happens. A few days ago, I blew an easy slam where I should have known to ask for aces but signed off in game instead. Later in the match, partner/husband made a mistake which even rookies don't make. Instead of making a nice 3NT game as everyone else did, we were down one in a bad contract. I was pretty angry and got up and left the table to graze the snack counter; snacking always curing all bridge evils. The opponent, Roger, wandered up and I asked him what he thought would happen if I shot partner/husband. He said, "you would get off". Okay, I laughed and partner/husband lived to play another day.
Maybe I'll start a support group for angry bridge players or maybe I'll hire Roger as my anger diffuser. The worst part of it was, having blown the slam earlier, I had lost my right to whine at partner/husband. Good thing.