I get that spacey feeling often. Sometimes it's when I start talking to someone I work with, or sometimes it's when I first go out on the weekends. I have had it for long periods (as well as filly dizzy all day). And, I'm not even thinking, or stressing, or worrying about anything. Sometimes it just happens. I think it's just our brains that have programmed themselves to react to certain situations. What ever it is, it is not fun at all. It's one of me least favorite things about anxiety. The short times of feeling normal are the best. All the other times really start taking a toll on you.