I had a migraine last weekend, I'm also tapering, and never put two in two together. But I guess that could explain it! I just took Tylenol (all I can have anyway), and sat in a dark room with an ice pack. Took 3 days to go away (like all my migraines last). It was pretty miserable. I've been fighting smaller headaches this week as well, but thought they were allergy related, my allergies have been bad too!
I don't know if mine was related to going down too fast. I've been going down 5 mg every 7 days. Going down to 5 mg tomorrow, down from 10mg. Then after that I'm going to do 2 1/2 mg, then nothing. Hopefuly that isn't too fast. My GI wanted me to go faster then that, so I slowed it down myself. But I agree with making sure you stay hydrated, and eat regularly! Don't skip meals, or wait too long to eat. I've found that is really a headache trigger for me.