what could be the cause of acute drop in blood pressure - 90/70 P 72, then to 160/94 P62. Feeling fatigue, dizzy, nauseous, rapid shallow breathing, blurred vision, numbness on upper to mid spine, and numbness on tongue. normal BP is 128/76 P78. I believe the initiation may be from being on my feet too long, hot temperature, or prolonged physical activity.