Suggest Remedy For Burning Sensation In Throat And Acid Reflux

What causes White tongue? A few weeks back while asleep, on a pillow that was not supportive, flat I should say. I felt a rush of I believed to be hcl acid rising from my stomach to my throat. I immediately woke up in fright. I felt a burning sensation in my throat and a taste that was acidic and could also smell the odor in my nostril. I was thankful I was able to feel the burning sensation rising up that woke me out of my sleep. I then notice a week later white tongue. Please explain. Pat