I too have the same symptoms.  I have terrible chest pain and palpatations and severe exhaustion.  I have asthma and trouble breathing and pain on the left side.  Lately I have pain below the breastbone.  I have only noticed recently that it seems to get worse when I eat; most especially dairy products.  I have had ekg's and worn a holter monitor and it does show an arythmia.  I was sent for a echocardiogram and was told the the heart muscle looks fine and not to worry because they don't see anything else wrong.  I have been on Prilosec on and off for years because they keep insiting it is GERD.  This has been going on for a few years and it has ruined my life.  I don't have the energy to do anything, I am depressed and feel like the worse mother.  I am tired of doctors not listening to me.  I have made an appointment with a GI doctor, maybe this one will be different.