You say it is undiagnosed: what kind of doctor have you seen for this? If you haven't seen a gastroenterologist, you should. If you have, it might be anxiety, and it would be prudent to see a psychologist or psychiatrist. If you broke your arm or leg, you would go to an orthopedist; if your having anxiety or emotional issues, you see the appropriate type of doctor, too.
It is worse if i lie on my right side. But moving doesn't make a big difference. I take baby aspirin, nothing else. I am pregnant, but i've had it before pregnancy as well.
Does it almost feel like a flutter sensation, does it happen more so while laying on your side? Are you taking any RX drugs, OTC drugs or Street Drugs?