I am so frustrated. I keep getting headaches from being dehydrated no matter how much water I drink.…

I am so frustrated. I keep getting headaches from being dehydrated no matter how much water I drink. the more I drink, the more I pee, the worse my headache. so I talked to my doctor and what does she say? "drink soda- not juice-soda". I am a very healthy person and do NOT drink soda. I've tried to go without it and deal with the headaches but today I just couldn't take it anymore. so here I am 2 sips into an orange soda and voila - no headache.