Is McCain hiding something? PTSD or just a short fuse?

I'm sure someone has already posted this, and people have been discussing it. But I was unaware of all the people that have spoken out with concern for McCain's temper. Our country is on the brink of disaster right now and I think we need leadership from someone who can keep a cool head when shit hits the fan. Neither president can fix this country. No president, no single person can. And congress holds the purse anyway. So I don't think Obama is going to be this country's messiah, but I do feel that McCain / Palin is another step down a path that has proven to be disastrous and destructive.