This Morning Woke Up Early With Severe GERD Pain, Heavy

This morning woke up early with severe GERD pain, heavy sweating, SOB. Drank water & baking soda, moved around, finally had diarrhea and pain subsided. Had similar attack last month, felt like a heart attack. Had heart checked w/stress test, all normal, BP is low, no abnormalities noted. I don't smoke, drink or take drugs, except 1 for digestive issues. Am underweight, 69 yr old woman, w/family history of early cardiac death (Mother). I have a hiatal hernia, IBS, am on Sucralfate and special diet to eliminate fermentable foods (FODMAP).