Drop in blood pressure as you stand up? Does it happen if you get up out of a bath, as I think light headedness then is due to a change in B.P and fairly common ?
I have been told that i am at that age for the menopause but it's not every time - which is annoying - and bloods came back all ok - just so strange. But what i may do is see if i can take a sample of when it happens and take it in to the dr to be tested see if that picks up anytyhing - seeing the dr in 2 1/2 week's time, if not we are puzzled but not nice
My son has had this happen to him. There are also many other people as he has found while doing research online. The headaches seemed to be tied with using the toilet, but are not really connected to straining. There is a name for the type of headache they are which I am sorry I cannot recall at the moment. When I speak to him again, I will get the name so you can search on your own.
It is called a thunderclap headache because they come on suddenly and peak within a short amount of time. Don't freak out when you look it up because a lot of the info is about this type of headache that is warning of an aneurism or the like. By percentages, however, the greatest majority of this type of headache are considered benign. Anyway, type in thunderclap headache, -symptoms, -definition, etc and go from there. One study that is ongoing I think can be found at: thejournalofheadacheandpain But there is lots more information. I hope this helps you.