Originally Posted by mrsD

I believe that if you have a serious hiatal hernia, where the stomach moves up into the chest, you can have SOB then and it would go away, when the stomach moves back down. The stomach compresses the lung temporarily, and it feels strange and sometimes alarming.

I have a severe hiatal hernia, and I get weird feelings at times, and it sometimes even flutters. Gas makes it much worse.
Lying on my left side makes it better. This is not an every day thing, as a rule for me. I have a congenital defect in my GI tract where it is also twisted... makes for many uncomfortable events.