i have gone through your problems.
occasional PVCs may occur from smoking,alcohol,from some drugs.but main cause related to anxiety and heart disease
now inform me about your age,smoking habit,blood sugar level,bp level,drug history.
do an ecg,echocardiography
and holter minitoring to exclude any heart cause.
if you are suffering from anxiety,then take anxiolytic.do meditation
you can consult a cardiologist