There is also the question of whether this change is desirable. As a broad generalization, people who have survived stressful situations tend to function better in them than people who have never been under these stresses. Unfortunately, those changes are often accompanied by other changes that, in some ways, make you function less well in a normal, non-threat situation. I think it's worth asking yourself whether your need to be able to function optimally in this hypothetical "critical moment" is more important than your need to be able to function well in a normal situation.
Amdur Sensei's character sketch of Sokaku Takeda came to mind as I was reading this.