From your post I get the sense that you realise that your emotional response to impatience is out of proportion to the cause. If you would like to control that feeling of mental anguish, might I suggest you take up meditation?

I've found that regular practice of the Focussed Attention style of meditation does wonders for being able to rapidly dismantle my feelings of frustration and take control of my mental state when I'm "in the field", as it were.