I'm not sure what's normal, but I will tell ya what I know! lol. I burp constantly now because of my GERD, and it's after meals and at all other times. I do think that people burp a lot after meals, now that I think about it. I'm not sure that tums would cure it, but it's worth a try for sure.
For me, heartburn is a sharp pain right around your heart area. I was relieved to find out that it's not actually your heart that's getting burned lol. It actually hurts quite a bit to the point where some people mistake it for a heart attack.
Hope I helped.