A week like that is like a tooth ache. When it's over, you feel SO much better.
In younger days I had migraines. I started keeping track of occurrences and found the majority were during menses AND an approaching storm system (low air pressure). Wasn't food at all.
Maybe they weren't migraines but they were-stay-home-in-the-dark miserable. One e.n.t. doc recommended cold packs--the cold caused the blood vessels to open--and that helped a good bit.
Sad about your cat. Hope you both are feeling better.