Pseudotumor Cerebri Support Group
Pseudotumor cerebri (PTC) is a neurological disorder that is characterized by increased intracranial pressure, in the absence of a tumor or other diseases affecting the brain or its lining. Diagnosis requires brain scans and lumbar puncture. Characteristic symptoms are headache, transient visual obscurations or transient visual loss in one or both eyes usually lasting...
But it is definitely a good thing to have done. It will lower your spinal fluid pressure and they will test for spinal infections, which could contribute to the iih as well. And it definitely could help you feel better in general.
I'd say definitely have the spinal tap done, and continue to see your neuro opthomologist. They will keep an eye on your nerve swelling and keep taking the pictures and tests of your eyes. You don't want the swelling to get worse. It could damage your vision.