For a little background, around my mid-20s I started having headaches whenever I eat certain things, like peanut butter or apples. I also started to experience bloating and stomach pain anytime I would go a couple of hours without eating. I've been tested for allergies and don't have any, had a routine checkup and everything was normal, and I had an endoscopy which didn't reveal any issues.

Recently I started developing headaches whenever I drink tap water. I switched to drinking purified water at my grocery store and felt fine at first. But after a few weeks, I started getting headaches whenever I drink that too. I tried other brands of purified and spring water, and so far the only water I haven't had problems with drinking is Dasani bottled water. I noticed some ingredients it contained I didn't see listed in some of the other waters I tried were salt, magnesium sulfate, and potassium chloride.

Any ideas why I would get headaches drinking other water? Could my water headaches be related to the food sensitivities I started developing in my mid-20s?

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