I actually used to get this when I had one too many of my favorite alcoholic indulgence that involved carbonation. a few good burps usually made it feel better, but sometimes not.
I think it is something like indigestion, with the pressure that almost made me feel light headed and out of sorts, since it was so painful! That pressure can only be worse when the abdomen is all squished with baby!
maybe one time during pg so far, I've had it too...(without the alcoholic indulgence, of course!) it's one of the only times I'd take a TUMS. it helped.
hope you dont have to deal with that too often!!!
The babymoon isn't over! Our long awaited A born 7/18/10, making us laugh and smile every day.