Small amount of pressure in lp . medicine was given. took me off. been having headaches . can the pressure reappear?

It can: You should check LP periodically and adjust medication accordingly. "csf is produced by the choroid plexus, the parenchyma, and the ventricular wall. These structures are capable of producing 400-600 cc's of fluid a day which is enough to completely fill the fluid spaces of the nervous system 4 times over". The CSF turns over about 3.7 times a day.