I recently, in the past week, have had the feeling at the back of my throat, as though I could get sick, or maybe that I need to belch-- even when I've just woke up, and i don't feel physically ill otherwise. I've had heartburn before, occasionally since i was like 25 or so. (I'm now 32.) Is this maybe what I'm experiencing-- and if so, is it as simple as using some tums or whatever?