There could be eye pressure - glaucumo type things which your eye sight can be perfect but your eyes are not - or optic nerve issues. Plus they are just good with headaches too - and may pick up stuff that is slight. That is why an eye doc may not be a bad idea.
There is no harm is going to a doc and telling them you have had a headache for 8 weeks - get an exam. Sinus infections can persist for a long time.
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