I agree with Oak. I have some strange reactions to foods and other things; I've had occasional palps, which usually mean I'm under stress, getting sick, or taking Claritin for more than 2 days. It kind of goes along with all of the other unusual symptoms I've had for the past 30 years. I've had a couple of cardiac ultra sounds since the first time this happened. Nothing shows up, so I assume it's nothing, especially since I can always associate them with some kind of physical or emotional stress, although sometimes it's after the fact.