Hello,I am 34 female. I had ASD device closure 9 yrs back,last month i had an attack of tachycardia for 30 mnts. Next day i had done my ECHO,ecg Blood tests(lipid profile), all seem to be normal cardiologist suggested me to take met xl 12.5 mg twice and he said he will do holter in next month.I also suffer from palpitations almost regularly i take medicine for hypothyroid.I am very scared particularly of heart attack & i have very frequent episodes of general discomforts.Abdominal disturbances a