I'm chronicly thirsty and my tounge gets orange, why could this be?

Many possibilities. The most common cause of thirstiness is not drinking enough wateer, but many other medical conditions can cause it too. Untreated diabetes makes you urinate a lot and be very thirsty. Other kidney and metabolic disorders are also possible.
Clean tongue. You need to use a soft toothbrush and an tongue cleaner to clean your tongue.