Losing my mind

The past few days I’ve been having really bad chest heaviness, throat tightness and anxiety. I’ve been eating low acid food no triggers.. I take pantropozole 40mg 1x a day. My appointment for a follow up with my gastro isn’t until the 18th. Last night I almost called an ambulance.. stuck on what to do. It happened at its worst when my stomach was really empty about 4 hours after dinner. Does anybody have any tips for these symptoms ?