I posted something similar not too long ago and didn't get too many responses but i think i can relate.
I get headaches, in a similar way you do, sometimes short quick ones, sometimes they last all day.
i get lightheaded, dizziness, brain fog where i can't think or talk right. i get numbness in my face and tounge etc...
ive talked to my dr. a few times about this and he doesnt seem too worried.
He says headaches can cause a host of problems, even the uncommen.
It can be very scarey. ive heard you can even get hot and cold flashes like the ones you mentioned( changes in body temperature.)
I see a Neurologist who specializes in headaches amoung other things.
ive had tests done
a ct scan of the brain
An MRI of the Neck and part of the brain.
if you havent already please see your Dr. and get a referral to a Neurologist.
If everything turns out ok, possibly this is headache related but your dr. wil determine that.
Also check your blood pressure after you stand up from sitting to make sure its not too low.
That can cause lightheadedness.
its nice to see that im not the only that has weird symptoms.
keep in touch and let us know what happens