Dear Friend,
Once your scanning are normal, then you can be rest assured that there is no physical abnormality in the brain (tumor or aneryusm,etc).
It may be migraine or cluster headache and treatment would be solely based on your physical examination and discussion with the doctors.
Keep the stress out of your life and give yourself some time off.
Beside this, doctor's checkup is must.
Please feel free to discuss, once your consultation is over.
Regards.
I get the same kind of headaches. My doctor told me they were called "ice-pick" headaches. I thought the name was suiting, as that how I feel, like someone is stabbing my skull with an ice-pick. It also might be something called a cluster headache. Whatever it is, it would be a good idea to talk to your doctor about it.