It's possible that you have a gastro - esophageal (possibly reflux) disorder.  Monitor what kinds of foods you've been eating:

1) Anything spicy.  This includes things with lots of spices in them, not just hot spices.

2) Foods like onions, garlic, citrus fruits, caffien and the like.

3) Smoking doesn't help either.

A higher heart rate after eating is normal because the heart pumps more blood to the stomach for digestion.  The nerves in the esophagus are very close to the heart.  Having an esophageal spasm or irritation can cause the heart to respond as well since the nerves in that area have very little in the way of pain sense and they get confused.

I have some pretty bad reflux and initially I thought I was having heart attacks.  Several trips to the ER and a few to the cardiologists determined that my heart was fine.  I was then pointed toward a specialist with reguards to digestive disorders and it was found that the sphincter muscle that closes off the stomach from the esophagus is herniated and therefore causing the reflux.

See your doctor about the possibility of reflux and what options you can explore.  Through diet and possibly a regiment of acid reducing drugs, it's controllable. 

On a final note, don't ignore it.  Chronic reflux can lead to things like barrett's esophagus, which is also controllable through diet and drugs - but can also be a prelim to cancer in that area.  Not something to be taken lightly.  Also, schedule a cardiac stress test.  At 48, it's not a bad idea to get an idea of where you stand on heart health.  More importantly, the reflux symptoms mimic that of a heart attack.  You want to absolutely rule out ANY chance that you might have some kind of cardiac disfunction before placing it on the back burner.  You health and safety come first!