it lasts for about 5 days. It is not excruciating but bad enough. I have had it over the years.My sinuses are fine. This time I had a blurred vision for 5 minutes. I dont believe it is migraine as I am told the pain with that is really bad and you have to lie down in a darkened room. What could it be ?
You don't say whether the headache is unilateral(one sided) or bilateral ( both sides)
Also if you have any underlying medical conditions e.g diabetes or taking any tablets for any other reason.
Does Paracetamol or Ibuprofen ease the pain. For how many years have you been suffering these pains?
Without the above information, I would say that it is a type of migraine which could explain the headache and the blurred vision.