God!
Had completely forgotten about this thread and was not informed via email of the replies

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I was now googling for "zurich migraine light sensitivity" and Google brought me back to this topic

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The migraines / eye-sensitivity are not new, so the odds that I have cancer are next to nil

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I had read about Irlen before, but I'm not sure it applies to me. I have light-sensitivity in general, and not only for artificial lights.
It's also no secret that diet can affect migraines -- I certainly know that certain foods can be triggers -- cold water, cinamon, milk, yoghurts, any drink with "anti-oxidant" on its label, etc. Caffeine relieves me of migraines but then causes habituation, then requiring ever increasing doses to bring positive effects. I ended up deciding to stay out of it.
What I've recently came to realize is that since I can remember I always had red eyes, but never gave too much thought about it. Maybe they have some sort of infection and the inflammation is causing the light-sensitivity? Or maybe it's the light-sensitivity that is causing strain in the eyes making them tired and red?
Hard to know..