Should I Get Scanned for a Brain Tumor?

I wanna try to get scanned for a brain tumour, this thought has gone as far back as grade 8 and I know this is out of proportion insane but I mean at first it started with the moments of feeling like I was getting dumber instead of smarter, not like beating myself up but just the actual feeling of losing information Then it was the foggy memories, messed up timeline, all of which I just kinda blamed on Parasomnia Then it was the derealization, the feeling of my grip on the world was leaving me and I’ve just tried so hard to fight it The change in my thoughts I mean I’ve become borderline obsessive, bi polar at my worst and even just thinking of life differently I mean in grade 9 I even just lost so much sense of fear, I started being way more reckless than before Honestly I wouldn’t be surprised if it was what helped Mono attack my body harder I mean looking at symptoms yeah I only have the less severe ones but even loss of hearing and vision change has kinda set in I’ve heard stories of people who didn’t bother to check man and it just makes me afraid that I’m a ticking time bomb until the time someone sees me faint and not wake up Today in class I got, so, so lightheaded, and I just feel this impending doom sitting on my chest man