At some point in my life I am convinced that I will develop brain tumors or I may even already have them!
Why do you think you'll develop brain tumors?
Nothing can dissuade my belief. I've researched this topic extensively
Fearing future health problems can really hurt your mental state. If you are genetically predisposed to an illness that causes brain tumors, talk to a doctor for testing. Otherwise, you should still talk to someone about your stress surrounding the issue.
I'm doing my own research, why should I trust mainstream research when it's likely corrupted due to pharma influence.
If you don't have the tumors yet, then you shouldn't think about these tumors at all. It's extremely unhealthy to worry about something that may never happen, even if you believe that you know more than mainstream research.