<s>[INST] Hello I am Debbra, Last Friday at work sitting relaxed , My heart began pounding & racing fast, from 8 am to about 2 pm every for 20 -30 minuted every hour durring that time, I was no pain, began being nauseated and sweating, it stoped then at 6 pm I went to dinner ate a few bited when i began feeling nauseated again and sweating badly, and passed out felt tired that evening, and nothing since [/INST] Hi, Increased heart rate and palpitations can have a lot of causes. It can be normal sinus tachycardia due to anxiety or stress, or it could be abnormal supra ventricular tachycardia. For the diagnosis, you need to do ECG at the time of palpitation and tachycardia. If the duration of palpitations are short enough to reach a nearby hospital, we put a 24hr ECG monitoring (Holder Monitor). You also need to do a 2D Echo and thyroid function test to see for any associated abnormality if any. Hope I have answered your query. Let me know if I can assist you further. Thanks, </s>