I got told that it could be indeed the case that my brain continuously has small seizures but only from time to time they break trough and cause the pain and auras which I would then experience. They wanted to measure the brainwaves to figure out if that was the case. That would also somehow fit what OP said, so I guess this is known in the medical world already. Or at least something in that direction.

Only that's not how auras seem to work. The current understanding is that they are caused by cortical spreading depression - a slow travelling wave which depolarizes the brain cells it passes through. These don't just happen randomly in healthy controls.

Well, I think the Auras is my brain failing to filter out visual noise, which then get's into a feedback loop and builds up. And that might be related to other filter functions failing. I think that, becaus4 once in a while, I'm able to suppress the Aura conciously, when it is still very small.

Some auras have a musculo-skeletal origin. For example, some neck issue irritates a nerve or alters the pressure in a blood vessel, which in turn affects the optic nerve.

I have suffered them myself, and they always came in a sequence: arm pain, neck pain, headache and aura. Finally, I'd release tension in my neck and it'd be gone.

My doctor confirmed injuries in cervical discs also seem to be causally linked to auras, but there might be other causes as well.