Hello there elephantlover, and welcome to the GERD section of HEALINGWELL. I am glad you are finding help over in the UC section, and I am happy you have come here for some suggestions!!! I am though sorry you are dealing with so much!
The fact that when the pain goes away after belching is actually a good sign that it may not be your heart. That could definatley be a sign of your GERD acting up. I am not saying that it's NOT your heart, and I am happy to hear that you have an appointment with your cardio. That should definately be looked into.
In the meantime, if you start to feel anything abnormal, if your chest pain is extremely persistant, or in anyway bothersome beyond what is regular for you right now, don't hesitate to call 9-1-1. Having had a heart attack already enhances your chances for another one. And, as I am sure you already know, the heart isn't the organ to mess around with.
I do hope you keep us updated as to what goes on at your doctors visit. I'd like to hear what is going on with you.
Until your appointment, try to take it easy, and relax. And, just be cautious of the different feelings you are having.
Wishing you all the best hun!
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Clickable Link that may be of interest to some...as I find I often like to check drug interactions...Drug Interactions