hello, i have been having heart troubles and this is what is going on.. Periods during the day my heart will beat very irregularly, and then it gets hard to breathe. I also lose my eyesight temporarily, and get tingles all over my body. I have wondered if i have been getting panic attacks but I am not anxious about anything and my episodes are'nt short lived and they can last up to 8 hours straight. Could you please help me?