Headache when shaking head

Every time I shake my head up and down i feel slight pain on my left upper side. Also, when I shake it lightly, I don't feel it, I have to shake my head a bit more. I have felt this for some time, but not all the time, just most of the time. Some days, I just don't feel it. On a scale where the strongest pain is 10, I would describe this as 1, maybe occasionally 2.
I am afraid this could be a brain tumor and I keep obsessing with that.
Thank you all for answers.

[rumpled]

I would see an ENT and get your ears checked. Then maybe an eye doctor as eye doctors can also can see signs of brain tumors. Why - your issues seem to be related to movement so it sounds like inner ear or maybe something (odds are not a tumor) with your eyes.