Does stress cause lightheaded, feeling off balance, and dizzy when standing up? suddenly, i felt like i was going to fall because i was so lightheaded

Maybe (not) . . .: Yes, your symptoms might be due to anxiety/panic disorder. But first you need to check w/your Family Doc to be sure it's not due to low blood pressure eg orthostatic hypotension, or perhaps a heart rhythm disorder or something else. In meantime, drink plenty of fluids (enough to make urine clear) & check your blood pressure at home while laying down, sitting & standing. Buy BP cuff at drug store.