Burning mouth: Have you looked into a possibility of Multiple Chemical Sensitivity? I am sensitive to perfume and other chemicals. When I inhale it, my tongue starts burning. It can spread to the rest of my mouth and even to the throat. I often get a bad taste in my mouth and feel dizzy. It can last for days or longer. The only way I can avoid this is by not using scented products and avoiding chemical vapors – and people wearing perfumes, which is very difficult. Good luck in your search for an answer, hope this will help!