There's a lot to be said for getting all the annoying junk in your head and dumping it on a scrap of paper.
I was feeling all over the place this morning, with a million things going through my head, stressing the heck out of me. But just spending ten minutes jotting it out in point form on a bit of paper, putting things in order, made all the difference. I now know what I need to do, and when to do it, and can deal with each thing as it comes.
I should really do this more.