two days ago I was testing a piece of potatoe from my oven, it didn't feel hot. However, when I put in my mouth, I swallowed it and it was so hot that it felt like I had a piece of lava rock stuck. It burnt so bad that I couldn't breath at first. Since then, it hurts so bad that I am having a hard time eating. There is a constant pain in my chest, even cold drinks hurts. What can I do to help the pain?