Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. I passed carefully through your question and would explain that your symptoms could be related to a panic attack. Anyway, gastro-esophageal reflux or an electrolyte imbalance can not be excluded either. For this reason, if these episodes repeat, I would recommend consulting with your attending physician for a physical exam and some tests: - a resting ECG and a cardiac ultrasound - a chest X ray study - blood electrolytes - thyroid hormone levels - complete blood count. Hope I have answered your query. Let me know if I can assist you further.