I think it's easier to worry about the small stuff because in our minds it's usually things we think we have control over, whether consciously or subconsciously. Also it distracts us from having to look at the bigger picture, which is usually far more worrisome.

I too must take life in the smallest chunks possible. When I forget, things can spiral pretty rapidly, due to my own symptoms. Hope you all find some relief and manage to catch those one or two perfect moments.