Does anyone have massive anxiety thinking that something is really wrong with them?

I have been struggling really bad lately and it doesn’t help when I feel symptoms that are very real to me, I try to say I’m just making it up but then I look up what the problem could be it points to what I am worried about. 

Right now I am freaked out I have a brain tumor. 

Idk if it’s the anxiety messing with my head or something else but something doesn’t feel right.