I had some pretty bad headaches, complete with vision loss in one eye a couple of times. It was narrowed down to a combination of factors: a high stress job, neck nerve pathway narrowing, high blood pressure, and a bad marriage. Today I haven't had a headache in years thanks to a divorce, retirement , exercise, and blood pressure medication. Not saying that's the ticket for you but it can be a combination of 'lifestyle' factors and an underlying health issue. Get a full medical test workup, including kidney artery ultrasound, and neck blood vessel scan. Good luck.
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