Hey I just wanted to post this because it might help some you. A couple weeks ago I woke up from a long night of drinking and my chest felt like it had butterflies in it and it felt like my heart was beating all over the place. My pulse felt alright and I was beating at about 90 bpm. This was actually normal for me. The felling continued for well into the next day and kept me up all night. Every time I would drift off my heart would start pounding and drive me awake. I also had very bad cramps in my feet and hands. Well long story short I did a lot research and found this sickness Hypokalemia. It's a potassium deficiency. This explained all my symptoms so I went to the store and bought a multivitamin, some potassium gluconate pills and some bayer to thin out my blood. Well within 2 days i was back to normal. If this helps you please spread the word. When I was looking this up I found lots of people with the same symptoms that were very scared like me.