Henry,
When dealing with symptoms in the heart, don't put off seeing the doc. That's serious chit man. It could be something as simple as stress related to the work you're doing right now, but let a cardiologist tell you that. My dad passed away at 57 from a massive coronary because he wouldn't do anything about the the symptoms that he had previously...afraid of what he might have been told by the doctor, I guess.
So his attitude was, if I ignore it, it will go away. Unfortunately, he went away instead.
Hopefully, all it is is that you will need to chill for awhile and avoid stress. It's probably all that time away from the "mellon" has gotten you stressed out. Seriously Bro, get it checked out and let us know how it turns out.

Let me reinforce this message with my own example. I started experiencing occasional chest pains in December 2006. Even though I didn't have a history of severe heartburn, I convinced myself it was probably just a case of GERD brought on by age. Like many men, I have an aversion to doctors and hospitals for anything less than missing body parts. In this case, however, the combination of my aversion to doctors and
my incorrect self diagnosis nearly killed me. I suffered a heart attack in March of 2007; fortunately I was at home when it happened and not out driving around by myself in the boondocks. My cardiologist has reminded me several times about just how lucky I was to survive.
Red, I extend my condolences for the loss of your dad.
Henry, please have this checked out ASAP. And when I say ASAP, I don't mean "when I find time". Please do it now.
Jerry