Don't freak out.
I think stress not only makes my brain screwy while I'm stressed but since it takes so much energy to be stressed out that my brain stays screwy until after I've rested it significantly. And that might mean a nap but usually means a full night's sleep.
And, as you know, the stress I'm talking about isn't every-day levels of stress - but the tiniest little wrench in the system. Something that I wouldn't even consider stressful if I had my normally-working brain back.

So at first, and still sometimes, it's difficult to recognize it as a stressful event.
Take it easy. Breathe.