I know someone who recently died of a brain tumor at 29 years of age. (It's one of the primary reasons I think I have such severe health anxiety now) She had pain behind her right eye. It never "moved around" like a lot of our pain, it never got better at some times of the day. It was never, there for a day and then not there for a day. It was constant, it was progressive, it was exact, it was unquestionable. She was a surgical nurse, and she KNEW it was something other than migraines, but with a baby girl to take care of and a busy life at work and with her husband she dealt with it until it just got too severe to function.
I tell this story not to inflict fear, or anxiety in anyone. Please READ THIS PART > Her brain tumor had DISTINCT, SPECIFIC, NON "Moving" symptoms that NEVER got better at any time of the day. It was constant.
So many of my "brain tumor" fears are things that might affect me SEVERELY in the morning, for example, and then be totally fine in the evening.
Another way I try to remind myself that it's just anxiety when I get symptoms is to remember back about 12 years ago. I had a severe inner ear infection that caused extreme vertigo CONSTANTLY for a month. It was CONSTANT. It wasn't better until it was better. I didn't have a good day and then a bad day. I spun from the moment I woke up to the moment I went to bed.
True medical illnesses tend to linger on like this (especially something MAJOR like brain cancer) They don't feel better in the afternoon one day and then the evening the next day.
Like someone else has said, it's not a "Perhaps I do, perhaps I don't" think. It JUMPS out at you like my friend.
I am so sad that she passed at such a young age, and it SUCKS that it causes me so much "if it could happen to her it could happen to me too" feelings. It's very, very hard to deal with. VERY HARD.
I hope this HELPS some of you and not causes even more anxiety. Trust me, when I have my numbness or my headaches I am SURE my Doctor is wrong and I am dieing, but here I am.... Still on the "sunny side of the dirt"