I was just doing some Qigong with the audio tapes about 15mins ago, and I was trying to go through the whole hour of active exercises that are on tape 5, but about 5 mins into it, I got this tingling, itching, stinging discomfort in my calves and feet that would not go away and was greatly distracting me. I carried on for half an hour with this going on, but it got it the point where I could no longer carry on, so I had to stop. In general I feel rather anxious while doing these active exercises, (I haven't gotten to the sitting meditation yet) and am not really encourged to get around to doing an hour or two each night. Is this normal, will it pass, anything I can do to make this pass?