i have gone through your problems.your blood pressure was quite normal,but heart rate was high,with sweating,nausea.
but you must inform me about your age,addiction habit,blood sugar,lipid pfofile level.
have you suffered this condition earlier?
but you must consult a cardiologist
your condion may happen from sudden nervousness.but it can happen from heart disease.
you do ecg,echocardiography
.monitor blood sugar level,lipid profile
.routine blood test.
monitor your blood pressure reglarly.
do meditation to remove stress.
but,first do above mentioned tests and consult cardiologist