Hi Susan330, Many of us end up with a form of hydrocephalus — that is what the Diamox is for. If you have symptoms such as the feeling of pressure in your head, getting motion sick easily, dizziness, mild nausea, sensitivity to sound, light and/or movement, or the headache at the base of your skull that radiates down your neck to the tops of your shoulders, you may be dealing with some hydrocephalus.