I have had those moments as well- I thought it was just me!
It's sometimes quite frustrating, though, when you are trying to illustrate a point and are at a loss for words. I've always been known as quite the chatterbox, so you can see how this affects me!
As for the spelling, I find I get confused even with the simplest of words sometimes! Somehow I've managed to keep on trucking- I just got diagnosed in March of my senior year, but graduated with a 4.0 nonetheless! Even with hospital visits and so forth, which just goes to show that the occasional brain fart now and then can go unpunished.