I've Had Pain In My Upper Abdomen/stomach, Right In The

I've had pain in my upper abdomen/stomach, right in the middle under my breastbone for 2 weeks, with a lot of gas and belching. I've also had an increased heart rate for about 2 weeks especially after I eat. I have some chest pain but it improves once I burp. I've been diagnosed with GERD. Should I be worried about a heart attack?