You dont necessarily have to have a spinal tap, they wouldn't really do that for mild/mod. I believe that is a step taken with severe head injuries, if a person is hospitalised and the pressure is v.high and v.dangerous.

Have you had any medical care/tests? Opticians can measure pressure on the eye, DRs/Neuros can assess your symptoms and see if they correlate.

Mine did, although neuro was doubtful about some of other symptoms he ordered a CT scan and 1000mg of naproxin a day to reduce brain swelling (which is a cause of increased pressure.) and pain. This has helped a lot, though may symptoms still persist.