So I've been freaking out for a couple of hours now about my heart. I woke up from a nap and my heart was pounding and my left arm was achy. A little bit of a back story, I've been having arm left arm discomfort for over a year. I was a dental assistant for a long time and would lean on my left arm/elbow a lot of the time. I also get this pulled muscle sensation in my left shoulder blade. So, of course now I'm thinking I'm going to have a heart attack. Common sense tells me that if I've had these symptoms for over a year, it's most likely not heart related, but once the intrusive thoughts start, it's so hard to stop them.