Hi, I'm a 30 year old female who is a non smoker, non drinker and doesn't take drugs. For no apparent reason, I get really strong butterflies in my stomach and I can feel my heart besting faster and stronger. I could just be watching tv, and it happens! Ive felt like this a number of times, and I can't help but concentrate on the whole feeling, therefore it affects my life! What can I do to calm myself? And can it just come on, when your sitting down relaxing? Thank you for your time xx