Hey Bruce, I can do Guinness too-as well as some other beers as long as they are not too fizzy or sweet. I also have a "hotspot" that is where the worst burning sensation takes place. Did you have surgery to your tongue? I did and the hotpsot, which is on the tip of my tongue, is an area where, after surgery but before radiation, would tingle when I drank wine or ate something acidic but not burn. In other words, it was some nerve reacting strangely from haivng a partial glossectomy. It was the radiation that made it supersupersenstive, though, and changed the tingling sensation to a pain sensation.
But David is right that you are still recovering way more than I am and you may find none of this is an issue for you a year from now. I hope for you that that is true.
Nelie