Yes, today after doing tai chi, tai chi fan, qigong l hour in sun, I always do, I teach these, I started with tingling up left leg, feeling lightness go thru me, I went in and sat down. I have had several injuries in left knee, leg area where I'd pulled or torn ligament, hyperextended leg, can't completely bend left knee to chest, may have had nerve damage. This was 4 l/2 yrs. ago, I've been doing ok, sometimes I reinjure a little. I'm 64 yrs. , female, haven't had health problems other than tooth infection last year. Although now my bottom left double molar, dentist said had some infection in root will have to come out. Would this be causing me the problem? I was very sick from the other infected tooth until had it out and bone grafting done.? Thank you. I couldn't go grocery shopping today.