V.W.
Well, I have no idea what could be causing what is going on with you, and it is good that you are planning on being seen by a doctor.
In the meantime, let me ask you this: Do you wear glasses? When was the last time you had your vision checked?
I ask only because last year, I suddenly began having daily headaches. Not migraines like you are having though, but daily headaches nonetheless. And I, too, am a person that NEVER has headaches. Seriously. Like... never. I MIGHT get a little tight feeling once in a while, and I will think--oh, that almost feels like a headache is starting, and then I get distracted and never think of it or notice it again. Advil at my house (for me) is only for strained muscles...not headaches.
BUT, last year..... daily headaches. Sometimes, almost as soon as I got up for the day. I'd drink my morning coffee thinking I didn't get enough caffeine the day before and just needed my morning joe. Nope. Headache would be worse. The longer the day went on, the worse the head.
My glasses were a bit scratched, and I just happened to go in to get a new pair/prescription check, etc. My prescription had changed. Now, my prescription has changed many times over the years (worsened) and I have never gotten headaches from it. This time my eyes were improved, so the prescription I was wearing was too strong! THAT was giving me the headaches. As soon as I get up I put on my glasses. So no relief after a good night's sleep.
Totally may not be even close to what is going on with you. But just a thought if any of it may be relevant to you. Mine started out of the blue. And went away the day I walked out of the doctor's office with a fresh set of contacts with a weaker prescription (until my new glasses came in).
Good luck to you. I hope you find relief soon.