I think I have a tumor in my brain. What do you think?

Anonymous
I'm 5'2 and weigh around 100 pounds. I'm 15 years old and I'm scared to tell anyone about what's happening because no one ever believes me. I've had my blood drawn numerous times, and I've had a stool sample. All the results have come back clean so I have no idea what's wrong with me. I have a hard time walking and I tend to fall every now and then. I've also noticed a drastic change in my eyesight. It's gotten a lot worse then it was at the beginning of the school year. So please someone help me, and give me some answers.
Updates
+1 y
When I say fall, I mean stumbling and then not being able to get up, or fainting. Also one time I was in my room and I fell and I couldn't get back up so I ended up falling asleep there because I couldn't get to my bed.
I think I have a tumor in my brain. What do you think?
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