I've been having pain in my right breast area that occurs while I'm having heartburn in the middle of the night. Is this common?
Your right breast is over the area where you find your gall bladder, your liver and where your stomach meets your small intestines. If you have severe pain you should have it checked immediately. Unfortunately, cardiac symptoms can mimic reflux so better safe than sorry. That said, it is possible for your pain to be due to the reflux. If you don't have your reflux under control, it may be time to see your doctor for a recheck.
Here are some other links you might find useful:
Heartburn Trigger Foods
7 Symptoms of Acid Reflux
Understanding Acid Reflux: A Doctor Q&A