Thanks everyone for the feedback!
On that last bit, yeah -- there is a jumpiness that I've never been able to shake, at least not without spending a considerable amount of time in the wilderness, like a week or more. After that point, the urbanite in my bones kind of relaxes and gives up, and then things are chill.
In broader news, I'm convinced that city life is somehow a subtle poison in the soul of man. That's not meant to be a condemnation toward anybody, or cities in general for that matter. It's just that, my intuition as I've grown older (I'm a ripe old 26) is that cities offer density and variety and connection and endless opportunity -- which is why most people in the USA live in them -- but I think our minds pay a price for all that stimulus.
By contrast, the few times in my life that I've lived and worked in rural settings, for weeks or months at a time, have offered me a kind of peace that I've almost never known in the city. I've slept better during those cumulative couple of years than I have in all the rest of my (mostly urban) life.
If anyone has any commentary on that, I'd be interested. It's one of those secrets of life that I guess I'll be forever investigating.