palpitation

I want to collect information about this condition since more than 15 years ago when it started. Its weird when i just woken up after sleeping(still on bed) i get this attack (tachy, palp) for some minutes. sometimes short sometimes long. And its not because of a dream. Im in relax state...

I have had this problem for a while but it seems to be getting much worse. I think it is probably due to anxiety but not sure. Whenever I lay down afternoon or at night I can hear and feel my heart beating. It feels as though there is a sledge hammer in my chest pounding back and forth. It...