I have severe burning in my throat and upper chest when I eat, drink, and exercise. It becomes worse with those activities, but I still have a sore throat and some chest pain even when I am not eating, drinking, or exercising. What is going on? When I exercise I cough up stomach acid. When I try to sleep I have to prop myself up quite a bit. I am used to basic reflux at night, but the severe burning in my throat and chest is new (for 1 week now) and very persistent, with very little let up.