Siiiigh. I don't wanna. It's true though.
Cold showers.
Especially after warm shower for the first half.
You should aim to barely be reacting. Focus on your breathing to distract your whole nervous system from the feeling of discomfort the cold water brings.
You're training your body to not react to adverse events. To roadblocks, to shitty situations, to things that might otherwise derail you.
Cold showers are key.
Or, ya know... Batting cages.