Have you seen a doctor yet other than the cardiologist who confirmed the pain wasn’t heart related? Years ago I had terrible chest pain and went to the ER thinking it was a heart attack. After doing the EKG and blood tests indicating it wasn’t a heart attack, they gave me a cup of what they called “GI cocktail”—which was an antacid.
The pain was gone within a few minutes. ER doc said they have many patients come in with the same condition thinking it is a heart attack. That was the beginning of my long road with acid reflux and many meds to control it.