Anxiety, Tension, Medication and Exercise

I have an anxiety disorder and most of the time it doesn't get in the way of my fitness routine. I have noticed lately that since my anxiety is up, my tension is high and I am not getting "loose". It prevents me from exercising, or it causes very sore muscles when I do. I know I probably should ask a qualified physician, but I am on a very low dose of Klonopin for my anxiety/panic, and wonder if anyone else sees it an issue if I am tense I can just take my medicine 30 minutes prior to working out. I swim, walk, elliptical and pracitice yoga moves, which sometimes is impossible when I am unable to move. Does anyone have any input or has had this issue?