hiii dear anxiety is sudden or can be insidious the symptoms that have you experienced is the part of anxiety there is no test to check out tes first you have to rule out ant heart related pathology if any test for that is ECG, ECHO etc if it all comes normal than start following to control your symptoms 1st you have to concentrate over schedule stress free schedule regular exercise meditations and yoga deep breathing exercise progressive muscle relaxation method is very useful. plz read on google for procedure do pleasurable activities enjoy hobbies music proper sleep healthy diet identify small small risk factor and try to modified it avoid smoking and drinking all of useful to you medicines sertraline is very useful to control daily stress if require than add on etizolam for acute control thank u get well soon