@lvon - I gave up anxiety meds and found breathing exercises more helpful. Here is a set I googled for you. I do the belly breathing any time I have an anxiety/panic attack and it has helped each time.
https://www.verywellmind.com/abdominal-breathing-2584115
Also for GERD attacks in between scheduled meds, sipping a little water helps to relieve the pain. I always have a glass of water or a water bottle within reach, to take a few sips as soon as the pain starts.