Not feeling good..

Something is wrong but idk what's up. I constantly have to drink water to feel fine. And if I dont the inside of my vagina starts bubbling and kind of burns. I dont have a uti been checked for it. Doctors say its cause I'm not drinking enough water. but I am! And I never had this problem before. Idk what's going on but it's so annoying and now I'm at the point I could cry cause I know something is up I just dont know what it could possible be. And doctors keep telling me to drink water. I drink 8 glasses a Day and it still bubbles. Have anyone else experience this?