I've been around too many high IQ/high anxiety folks. My read is that many of these people constantly obsess over everything that can possibly go wrong and try

I've been around too many high IQ/high anxiety folks. My read is that many of these people constantly obsess over everything that can possibly go wrong and try to think about work arounds, literally ALL their waking hours. They are master at finding things to worry about far in future whether its job, work, house, relationship, friends, family. It's like you are playing a big game of chess but you compulsively think about 8 moves deep instead of just 3 or 4. As you will totally overload yourself and always keep encountering pretty bad scenarios, it keeps you tremendously stressed all the time. Like your overclocked laptop is running very hot and built-in fans aren't able to keep up. The people who I thought had normal or even slightly below normal IQs live rather chill lifestyle and assume things will just take care of itself. I think the amount of average stress you experience after adjusting to direct causes is a pretty good signal of IQ you have.