Oh yes, definitely world-wide over-the-counter drug: Gaviscon and Gaviscon plus is even better!
Is that sold in the US? I should probably buy some prilosec or something. Seems so odd how it came out of the blue! I had not been feeling well the past couple days, bumps on tongue and it felt burnt, I would see my doc but I feel silly over a little thing as this.
What you describe does sound like acid-reflux. Make a list of what you had to eat today and avoid that for a while. When you do get that "hot soup" feeling again, drink Gaviscon and if it feels better, then you know that was typical acid-reflux.
The cancer sores in your mouth can be an indication of a viral infection and you need a bit of extra VIT C to cure that and avoid cold drinks for a while and treat your throat with some herbal-tea with a few drops of honey in it.
Hope it helps and that you feel better soon :)