I'm glad everything is fine now! I just thought I would add though, I have SVT (supra vantricular Taccicardia (sp?) and it begins exactly how you are describing then escalates. It doesn't usually last for very long either but can become scary... I was thinking maybe you have this very mildly cause my doc told me it's common in pregnancy. What REALLY works for it (funnily enough) Is take a deep breath, pinch your nose & close your mouth so no air can escape then BLOW! kind of like if your trying to blow the air out your ears (like when you pop your ears when on a plane) Sound ridiculas I know but my cardiologist taught me this one years ago & it has never let me down. It seams like it re-sets my heart beat or something weird like that! HTH in the future!