Stuffing

I don't think it's cause for alarm. But it's definitely the change in your diet that is to blame. If you've been eating a lot of spicy foods then that's probably it, or maybe just acidic foods like things with lots of tomatoe sauce in it. Or pickles, could be any number of things that you've eaten.

Try cutting back on the more acid stuff, i/e spicy etc, and see if that helps reduce it.

You can start drinking more milk, that can sometimes help. Milk has natural antacid qualities.