Feel like I'm going to fall down when standing. Really light headed and weird numb feeling all over body when standing up or walking. Extremely stressed?

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.