It's possible you're swallowing more air when you drink hotter liquids.
Thanks for the thought--it's a possible factor I'll try to remember to watch, though I notice it even if the liquid is cold when I drink it--even iced. In reading about coffee, I learned that the hotter and longer it's roasted, the more acidic it becomes, which it occurs to me could be a factor in the belching with coffee and other beverages that involve heat in the process.
My question is whether it is just an issue of quantity. Half a bottle = terrible reaction. 5 ounces = positive reaction (as far as I can tell at this point with limited trial).
Maybe, though in my case I don't get that bad a reaction from my best-tolerated alcoholic beverage even if I drink 1.5 bottles worth (750 ml), though I fare better if I keep intake below 1 bottle (500 ml / 16.9 oz).
Phil - do you have sources where I could buy mead from? Mead would have an extended shelf-life unlike wine right?
Not in my home, LOL. Sorry, it's only sold in Vermont. I would look for local artisanal/craft mead, if there is any in your area.
A trick to help spot unpasteurized alcoholic beverages finally dawned on me. Tyler explained that you can tell unpasteurized (cask) ale by the metal wire and cork on the top. Then when I read that champagne is raw, I realized that it too has a wire and cork top. Then someone mentioned that unpasteurized hard cider also has wire and cork stoppers. It still took some days for it to fully dawn on me and start looking around in the liquor store and beer/wine/mead-selling markets for bottles with wires on the top to see what else is probably unpasteurized.
In using this trick I found a bottle-conditioned fig wine. I like figs, so I tried it. It tasted horrible, was extremely bubbly, and gave me gas and a mild feeling of malaise. No euphoric effect at all. I ended up dumping most of it out.
There are apparently unpasteurized alcoholic beverages that do not have wire/cork tops. Sierra Nevada claims that all of their brews are unpasteurized (
http://jarticle.hubpages.com/hub/Unpasteurized_Beers), yet most of them do not have the wire/cork top. Sho Chiku Bai Nama Sake is claimed to be unpasteurized, yet it too does not have a wire/cork top. I think the wire and cork is only needed if the yeast is still alive and actively emitting gas, possibly causing pressure to build up and blow a standard cap off the bottle. It's possible to have no live yeast left in an unpasteurized beverage. It's apparently also possible for some critters that actively ferment to not cause a lot of pressure buildup from emitted gas, such as in kombucha, kefir and other fermented beverages sold in markets that don't have wire/cork tops. Blogger Seth Roberts recently reported that store-bought kombucha contains live critters that can be used as a starter for making your own, yet they don't have wire/cork tops. The wire/cork top is one clue, but not lack of it does not necessarily guarantee that the beverage is not unpasteurized, so Internet searching, checking labels and asking around also helps.
I suspect that some beverages with wire/cork tops could be heated--they could just add live yeast back after heating, so that it can bottle-condition (continue to ferment).
It's interesting that a pasteurized mead has less negative effects on me than several unpasteurized and bottle-conditioned alcoholic beverages, including the real ale I tried. Heat and bottle conditioning do not appear to be the only factors for me.