Why my head hurts?

Am feeling headache an often,am am sure of pressure changing, but at home am not having tonometer, which signs directs about a low or high pressure.
Yes, probably you are right, headache are changes pressure directing, and in hypotonia and hypertension, and how define this and which charactery as in you?And in which part of Head is hurt feeling, squeezing,as in hypotonia aches are in temples and in hypertension are in occiput. And such diagnosis is not enough as for selecting remedies she rising or lowering pressure,and you need visit a doctor, but you must to know headaches has and other reasons,therefore a remedy improving your pressure will not improve your condition.