I do this, especially when I'm in one of my sleep deprived states. But usually can counter by challenging the thoughts; how likely is this, really! But sometimes when I've been without sleep for a while the thoughts take on a life of their own and I end up just being jerked around and reacting emotionally. That's always a bad place to be and I know I need to call out for help. I need the help of a person outside the chaos to point out the reality.