I suddenly got blinding headaches over a year ago. The first time I ended up signed off work for over 4 weeks with the first week spent mostly in bed. I saw my GP who gave me pills, trying several different types, finding out I am intolerant to some and eventually finding one which meant I could function again. I also had to have a brain scan (see if there was something there
and a neck scan to make sure there wasn't something else causing it. In the end they said it was referred pain from another condition I have and so found that treatment from my osteopath sorted out the pain, if I feel it coming back I know I need to slow down and get plenty of rest.
The headaches are your bodies way of telling you something is wrong and you can find a way of controlling them.