I've had that feeling too, sometimes, but I think mine actually occurs after taking a pill. But I've had a similar feeling of heaviness in my chest, as if I have air trapped in it. It happens sometimes when I sleep, and I have to pound on my chest to try and move the air up. Maybe this is caused by a hiatal hernia, I don't know.
Oh, and I should say that the last time I had that feeling, I ended up getting a sore throat and laryngitis, so maybe it is a sign that you are getting sick. It's not a usual symptom for me, but maybe it's a different kind of cold virus.
I actually ended up burping for around four days, it just went on and on. Yesterday it started to ease up a little bit, although last night I started to feel like I was going to lose my voice. Very weird. I'm ok this morning.... so far (it normally starts an hour or so after I get up)
Wow thats pretty early.
Well the burping/lump in my thoat feeling went away FINALLY - after nearly a week. I'm so relieved.
Perhaps it was some kind of preg symptom - cause I now have BIGGER boobs, and they're slightly tender - something I never get, even if AF is on the way - and thats been going on since Thursday or Friday.