Headache Remedies?

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I've been getting headaches everyday for the past week or two. I don't drink much water but I am trying to drink at least a litre a day.
I'm in a better state now that I was last year. Last year my eyes would go blurry and my head would spin after standing up from a chair. I didn't eat much and I used to stop taking showers from the bad hallucinations.
I'm not hallucinating anymore and I'm actually eating more than I should. I've gained about 10kg in a few months. I'm drinking a bit more water , but I am still getting headaches. 
What should I do?