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I met someone 6 years ago, and basically he was trying to see if it was normal to hear a sound inside your head, he said it sounded like how a t.v sounds when you turn it on, the frequency sound.
I see those tiny flashes quite often. Doctors say it's a type of visual migraine that may or may not come along with a headache. Once, I even went half blind for a few minutes from it and that time had a headache for a full week. I also hear that noise, possibly related? I may ask a doctor about that. I don't feel that any of this is paranormal, not in my own experience at least.
It may seem odd if you haven't heard of these symptoms ( I had not until 2 years ago) but I think it is somewhat common.