Sickness = No Muse

I started to get sick yesterday and couldn't sit in front of my computer for too long without getting dizzy and feeling weak so I didn't get much writing done and got absolutely no work done for my day job. Today I don't feel quite so dizzy and weak, but I'm still feeling awful and I want to write but nothing is coming to me. I have 21 days until my goal deadline so I have plenty of time to write the last 20,000 words, but I feel guilty when I skip writing for a day or two. I think this sickness has sucked all of my creativity right out of my brain. Hopefully tomorrow it'll come back to me so I can knock out a good chunk of the remaining words needed to finish my book.