I'm in the same boat of pressure changes, and it's always humid in Florida. I have found mine are the worst during PMS added into the air pressure. They have gotten worse since my partial hysterectomy, but still having the ovaries there is still estrogen? I started with Maxaalt that knocks out the headache- and me for 2 hours. So I never get to take it till bedtime, and my doctor pal said the same thing about starting the meds early. He said if you don't try within 1 hour it may not go away. I use Excedrin Sinus all day until the Maxaalt. Last Fall I took Topomax, which worked great ont he headaches but such bad side effects I had to stop. Then went to Depakote, almost as good and almost as bad side effects. I cut the dose in half and it's slightly less side effects, but almost no pain relief.
Next week I am seeing my GYN and will talk about horone control. I used to take BCP continuous for the endometrioisis, but stopped after 1 year post-op. Any advice for what type of hormones- more estrogen or less?