Chiari Malformation?

I came across something called “Chiari Malformation” that has the same symptoms as a brain tumour; the same symptoms I have: headaches, dizziness, sore stiff neck, nausea, sleepiness as well as other symptoms I have as well: eye/facial pain, excessive thirst, peeing a lot, tingling/numb hands and feet . This might be a possibility of what could be wrong with me(either that or a tumour, based on my symptoms). It is basically an opening in the base of your skull and parts of  your brain “leaks” into your spinal canal and can compress the brain stem(which regulate breathing and heart rate)which, of course, can be fatal for obvious reasons, and cause pressure in the skull with blocked CSF, causing hydrocephalus. It is a defect one is born with but symptoms don’t appear until late childhood or adulthood(and oddly my headaches started at age 13) and is more frequent with people who have Spina Bifida or Marfan Syndrome(of which I also have most symptoms of as well). It requires surgery to correct. Makes me wonder though; same symptoms, so which one IS it? Who is the “winner?” Do I have a brain tumour…or Chiari Malformation?Or neither(just an incredible coincidence?) 2 of my girls(ages 14 and 11) have headaches frequently as well so I wonder if they might have it too, esp. if it is genetic? Just makes me wonder…