I'd had flu before Christmas (and just had to carry on through it, as had four small children and a 'D'H who wouldn't take as much as half a day off to help me). Ended up the week before Christmas with the most AWFUL headache. It just wouldn't shift, I was pregnant so the doctors couldn't give me anything, they were talking about meningitis and gave me antibiotics and codeine (which I couldn't keep down), then Valium.
I drifted in and out of consciousness all day, while trying to co ordinate Christmas for four kids under seven; their father had no idea which presents were for who (he never did lift a finger to help with Christmas, or anything else for that matter). He took them out for a walk so I could rest, but came back ten minutes later because it was 'cold'.
The headache continued through until the middle of January when it gradually lifted, by then I was driving the kids to school with my eyes closed to slits and frozen peas on my head.
The 'D'H only lasted another two years. It's been over twenty five years and I still remember the agony and trying to keep things Christmassy when I couldn't move. I don't even remember most of the day.