Hi. I've been on Levo for 5 months (100mcg). I'm much healthier for it, lost a stone, feel better etc.... But, I have sore knees, feet, Achilles and calf muscles. If I've been inactive for say 30 mins, everything stiffens up, and the first minute of moving around again is quite stiff and painful. Anyone else have similar issues, and any ideas what I can do to help this.