Is your sodium and or sugar intake too much? when I drink diet drinks, or gatorade and such for nausea I get more and more thirsty. It can be an endless cycle when I am sick at my stomach. I am sure to rinse my mouth and spit when I get super extra thirsty now.
If you have any of the other symptoms of type 1 diabetes I urge you to seek medical help ASAP and get your blood glucose level checked as untreated type 1 diabetes will lead to diabetic ketoacidosis which is fatal if untreated.