How to have clarity of thought during high pressure situations?

I've always found myself entering an extreme flight or fight mode and I'm not sure if this is due to my ADD but you could consider me an anxious person especially during production incidents which makes me want to just run away.

I freeze and act at a brain capacity of like 30 percent lower than I am in a flow state and I never manage to enter flow state like I do when I'm working on something fun like feature developments. If you think about it I'm missing out on learning opportunities which you could get while you are on call and I wanted to ask for some advice on how to deal with the anxiety you get during production incidents like product failure or feature failure etc.

I realised that you can't keep running away from problems and need to face them to be able to navigate these complexities both at work and in life and I'm looking for advice on what steps you guys take?