I'll try anything once. Did you take the HCL also?
OK, at the risk of sounding nuts, I'll share the following:
I've had that, and the burned tongue feeling eventually turned into a bout of CONSTANT dry mouth feeling that drove me crazy and lasted for months. Everyone kept just insisting it must be Sjogrens but tests were negative and I didn't have any other symptoms. It's under control now and only flares up occasionally but I've definitely seen the correlation between the mouth/tongue discomfort and my stomach, specifically low stomach acid. In fact, sometimes I wonder if that's what's behind the mysterious "syndrome" of Sjogrens, which my doctor says they call anything they just don't understand and therefore can't "cure". I searched for months, and in the end I tried a natural tonic I read about on the internet and within a day or so the symptoms were 95% gone and my "off" stomach issue was totally resolved. I still do it these days but just a few times a week. I'm like you, no gluten/dairy/soy and only whole foods. This tonic fills that bill:
2 TBSP Natural Apple Cider Vinegar (with the mother - like Braggs)
1/4 tsp Baking Soda
8 oz water
raw honey to taste (optional - the ACV/BS combo is actually a bit sweet on it's own - you don't need much honey, if any)
Back then, I would drink this just before eating breakfast, lunch and dinner. I think the tonic is more to help the body achieve a healthy pH. These days I've substituted seltzer for my water in the drink and it's like enjoying a softdrink (without all the known carcinogens of canned fizzy drinks). Worth a try!