My tongue has a white colour over it, had this for a few days now, and feels quite weird and nippy when i take a drink or eat something. I've been told could be thrush in the mouth and to drink plenty fluids. I've also bought a medicated mouth wash to start using, it's called oraldene for mouth ulcers,gingivitis,mouth n throat infections. It tastes horrible and you cant taste your food or drink properly when you use it but i've used it before and it only took a couple of days to clear up a mouth infection before. Maybe you should try this and drink plenty fluids like I am going to try ?