I think I do have some symptoms of hydrocephalus – I get that terrible headache at the base of my skull that radiates down the shoulders, motion sickness, and ringing in my ears (I also sometimes hear a whooshing sound in my ears when I stand up). I also have visual issues – I have double vision again (I had strabismus surgery about 10 years ago which corrected it until recently) and sometimes my vision seems to blur. I’ve been wondering if these visual symptoms are due to high intracranial pressure or just another symptom of POTS (since sometimes I notice it when I get dizzy).