I Have Now For 2 Months Had Tingling, Muscle Pain,

I have now for 2 months had tingling, muscle pain, stiffness, weakness, feelings of 'bigness' of feet, numbness in big toes, and 4 weeks of physio treatments, but the condition continues, espec. in left leg. Lately when I stand still for a few minutes in church, a store, or at the kitchen counter, I cannot move my feet, they refuse to move and if they do, they are very weak. I am healthy, 82, still quite strong and able to do physical work.