Here's something weird that someone who, unlike me, is a doctor or research scientist should check out.
I get migraines. Many of them are food triggered, but not all. Probably 1.5 mild ones per week, one medium one per month, and one killer migraine every three months or so. With a record, thus far, of "Take me to the ER" migraines every two years.
That being said... I don't think I've ever had a migraine while suffering from a cold. I get stuffed up, and maybe end up with a sinus kinda headache. But never, not once, a migraine.
I wonder if something that my body is kicking out when I've got a head cold does something to suppress migraine stuff. See? We need people with biologimical learnin' on this one.