Nerve problem. Dose? what will i do now?

I am an epileptic patient for 8-9years. I used to take 500mg Encorate Chlorono twice daily. Last yr my doc lower the dose and now I take 300mg twice. My problem is from last 2-3 months sometimes i feel some sensation just below of my knee. The more I think about it, the more I feel it. This this happens mainly  when I stay alone. Unknown fear works on my mind as I think if something could happen then ? I found sound on my shoulder joints and knee joints if I move my legs and shoulder joints. The sound grew more when the sensation starts while I move the joints. But after some time the sensation stops if I think other things. I am very nervous now. Is it normal.? Is it due to lowering of dose? Or due to weakness? Or due to nervousness? Is this happens during lowering of dose? What will i do now ? Please advise.