Triggers: Feverfew And Decaf Coffee?

Hi Everyone,
I've been trying to follow the patterns of my headaches and migraines in the last weeks. I read that taking Feverfew and Magnesium can help prevent migraines or reduce their frequency/intensity over time so I started taking both. I seem to be doing OK with the magnesium but I took a Feverfew capsule (380 mg) yesterday and noticed soon after that I developed a migraine. It wasn't a hugely bad one but it was definitely there. I'm now in migraine mode (again, not bad but there) today as well. It seems odd that it would be the Feverfew because it's supposed to help prevent them.

However, I also started drinking coffee again on a regular basis this week. I drink 2 cups a day and they are decaf coffee. So it might also be the coffee? I know that caffeine is a migraine trigger for many but I've been eating chocolate (an ounce of dark chocolate most days) and it hasn't caused any migraines. So maybe it's something else in the coffee beans themselves other than caffeine that are causing the problems. I've drank the decaf coffee every day in the past six months (gave it up for only about 2 weeks for green jasmine tea) and it never caused problems, so I don't think it's the coffee.

Of course, I am going through a stressful week, as my dad is going into a pretty serious surgery tomorrow, so maybe it's the stress as well. I don't feel the "butterflies in my stomach" kind of anxiety stress but it wouldn't surprise me if the stress is showing up in my head.

Tam