Hi, I suspect I might have a brain tumor. I'm 15 years old. In spring of 2008, my vision became "wierd" in one eye - I had taken off my glasses and when I put them back on, it was like as if someone placed one lens close to my eye and the other lens of my glasses far away from another eye - that was what my vision was like. I thought it was a vision or diabetic (I am not diabetic) problem and went to an eye doctor, all he said was that I needed new glasses (he wasn't very knowledgeable. Then in the Summer of 2008 while I was on vacation in Los Angeles, several places and days when I walked outside on the streets or inside a hotel room, I felt unbalanced - as if the the ground was going from side to side. Then, after my vacation, still in the Summer, usually in the mornings whenever I opened my bedroom or bathroom door, this black flash filled my eyes - each time for about 3-5 seconds. The black flash has not happened since then. The unbalanced walking has not happened since then until now - about a week ago while I was at the library. I rode the elevator the the second floor. When I stepped out it was the same unbalanced walking feeling I had exerienced during Summer's vacation. Then two days ago, when I went to return my books, I rode the elevator again, and still the same feeling. And another thing, when the elevator was going down on both trips to the library - I jerked, whenever it started going down - as if my body was still in place when the elevator was still and my mind at the place where the elevator was moving to (hard to explain the feeling) - I experience similiar "feelings" while in the car on the road, whenever I keep my eyes on a road sign on the highway - when the car is just about to zoom past the sign, I jerk back. These "feelings" I have had a long time, or when I am on the swings (childhood), and the swing is going down, I jerk back (similiar to the elevator and highway feelings). They might be - as I recently dicovered - seizures. My memory, recently, has degraded badly - it takes me 10 seconds or more even to remember what I should be able to remember instantaneously before. And just a little extra thing that might help to see what's wrong with me - whenever I close my eyes to go to sleep at night (not always but a lot of the time), I sort of see the darkness going back and forth as if shaking my head back and forth several times before going to sleep - this symptom I have had since as long as I can remember. Thanks in advance for your help.