Heart Attack From Stress. It checked?

In 2012 I was diagnosed with Bipolar Disorder, BPD, Severe Depression, Panic Disorder and Insomnia. I have a long history with depression, self harm and suicidal urges (I have attempted suicide multiple times). I'm doing much better now, as I'm able to understand my condition and take precautions before I let myself do something that I will regret. However, my panic attacks still continue and they've become more painful than usual. I sometimes get many of the symptoms of a heart attack, including a pain in my arm. I'm aware that panic attacks are often mistaken for heart attacks, but I was wondering if it was possible at all that I have a heart disease- and if so, how do I get it checked? I've been having a doubt about this for about 5-6 months now, so I think I need some advice.