Hi sallyjoe, Welcome to Healing Well forum, we are happy to have you. Arrhythmia's are basically any change in the hearts natural rythem. I will post a link from the AHA website on them for you. I have Bradycardia & Sick Sinus Syndrome which is slow heart rate for which I have had to have a pacemaker implanted...I'm 33 yrs old. There are some people that say they can hear their own heartbeats...I'm not one of those...heartbeats way too faint 
, but I can believe that this is true. Do you have a cardiologist? Have you had a work-up done? Is there a family history of heart diease in your family?
I am sure others will post with some ideas/suggestions...hopefully. In the meantime please do feel free to continue to post we would love to hear more from you. Take care http://www.americanheart.org/presenter.jhtml?identifier=560