@Selira Seconding Wretched on this one. Some forms of stress or crisis can force focus. A lot of ADD/ADHD folks are kickass in a crisis as a result, while everyone else is running around like chickens with their heads cut off.
...if only we weren't, you know, the headless chickens the rest of the time, dammit. 
I hit this one hard when my gall bladder went to hell. Literally dying, and I was like 'you are going to wake up and we're going to the hospital now, be ready in 15 minutes'. Everyone else, freaking out. Me? Weirdly calm, cooperating with the things that normally freak me out without a ripple.
Like... I normally flip out any time blood needs to be drawn. They had to do so several times a day for two weeks, until I was very literally so out of veins they were having to go for things in the joint of my upper knuckles with my fingers bent down, and they had to run a picc line which is... really just body horror like whoa to me.
Normal me: "OH GOD I'M GOING TO DIE".
Crisis me: <snapshot of calm stoicism>