I've had a lot of moments where I've felt over-whelmed recently. A big work project plus various other chores. When I'm like this I get a sense of trying to keep everything in my head at the same time.
Recently I've been making it a practice to keep lists and to concentrate on the thing that's in front of me. Everything else will be there when I need it. I just need to keep my nose to the grindstone rather than fretting over all the grindstones yet to... nose.