What Could Recurring Numbness In Left Leg Indicate?

Hi there I wish to share a problem I ve been facing for years now. Every time I come across something unlikely, I feel numbness in my left leg that disappears within minutes. It shows up every time someone misbehaves with me or there s a possibility for the same. When face it several times a day when I m getting late for something or when I m worried about something. I d like to mention over here that there s no increase in heart rate or breathing. I m really comfortable even in the worst of situations except my leg. I don t smoke and I rarely drink. I take 5-6 cups of tea in a day and mainly vegetarian food. Please help me understand what might be the reason and if there s something I can do to move out of this.