Less pressure means less glucose and oxygen to brain so the brain will get your head a ground level so that it can get the needed
glucose and oxygen which is why people faint...........
High blood pressure will most likely cause a headache, but then again anything is possible.
I keep my pressure low with 400 mg magnesium, 5 grams time release vitamin c, cayenne pepper capsules, walking about 30 minutes daily, and 10 mg Lisinopril.