I tend to live more in the future, thinking about what could be, dreaming, and such. they don't tend to be pessemistic thoughts though, more optimistic ones.
I think enfp personality's worries are more about their insecurities than thinking about meeting ends. But that's just my personal penny.
I'm prone to mild panic attacks, but I've learned to deal with it. Since it might (and often does) hit at work I have no other option than to suck it up and get over myself even when I'm clawing at my own throat because I can't breathe. I also manage to get nervous to the point of not functioning properly, but I don't think I have any real disorders.