i had inflammation in this area which caused vertigo, and falling. i was given a medicine from ENT that is in the benedryl family, and it helped eliminate the vertigo, but i did not have a shunt or tumor. My spinal is collapsing onto nerves which has caused inflammation in this area, and wrong commands were going to the brain. . What i see and think isn't actually true. i.e. I can lift my foot 5 inch, but really need to lift more. Can't tell difference, so i trip and fall. - I am doing much better now, and have stopped falling.
I'm so sorry for your condition. What kind of Brain tumor do you have? Is it GMB or something else? If it is GBM there is a clinical trial that they don't have to remove the tumor for by Tocagen. They have the trials at UCLA, UCSF, and UCSD and maybe other places and it sounds promising. If you don't have GBM I thought I would try. I have vertigo but not due to a shunt. It is due to my migraines and they use Topamax to control it. Topamax works on seizures too so it could possible help if that is the cause. It is possible the tumor is hitting on a place that is causing the vertigo. I hope this helps.