Dr. Joe Here,
Headache and Migraines are aweful. They start from little nagging things to pounding, throbbing day ruiners. If we find out what is the cause of it and stop doing it then it will go away. Many people have tried water, diet, decrease sun exposure. Lets catch these headaches before they become worse with medication, rest, a cold towle, darkness, but the bottom line is that you can try these and you're not affecting the cause.
Where it is comming from is the nerves from the neck. They get irritated and travel to the brain causing headaches. Just get the irritation off the nerve and the headache will go away. Correct the cause don't change your environment.