Beth,
Yup. A LOT.
Good advice from SadRobot... you
have managed! And will again. Proof!
On a variation of missbelle's advice, if you are a list-maker try writing things down that are
already done and cross them off. Doesn't matter how small. Like..."brushed teeth". Just looks good to have some things crossed off, you know? Can help with the overwhelm of looking only at what is undone (and the perception that creates). Used to have an art teacher that advised, say, spilling some ink on the blank paper and go from there. It's the blankness. The not knowing where to start that sometimes builds into anxiousness. "Accidently" do some tiny thing before you even can think about it (for me, this might be BC...before coffee

). Or grab the phone and dial the number while you pull up some pages on the computer. Then, your mind is distracted. Or at least divided between a distraction that doesn't cause you stress and something that does. You're not making a call, just punching in numbers, see?
Hope this doesn't sound like procrastination advice. Ok, it is and it isn't. Thing is, for me anyway, there's the anxiety, then things either pile up or stay undone for "too long". Creating more anxiety. Overwhelm. Oh yeah, he's in there too. Even when there's hardly anything! Ack! Point is, it can feel like a viscious circle. "Tricking" your mind can be a help in pulling out of it.
Take it slowly and don't beat yourself up over it. It'll pass. (And hey, having BP, you know this is true! Think of all the times you get everything and a half done! It all evens out.

)
(Btw, I like your quote line.

)