There's a clue in the photo.
Normally a cold wouldn't be a big deal, but tomorrow I have another chemotherapy treatment. I called the Cancer Agency wondering if I needed to take any extra precautions, either for myself or to avoid infecting anyone else.
They said a simple head cold was indeed no big deal, and that I should just rest, drink fluids, and have some soup. (There's modern medical science for you!) I'll go in for the treatment tomorrow as usual. I expect a compound crappy feeling by Thursday, when the chemo usually feels its worst.
I will also take this opportunity to reinforce that Tylenol Cold really works. I no longer have the pounding sinus headache I woke up with.