I'm having a terrible time with stiffness and pain in my left forearm. It comes and goes. My PD started on my right side with tremor but my left side is worse with the stiffness. I exercise 2x week and walk almost everyday. I take 2 1/2 Sinamet daily. When I exercise the feeling goes away temporarily. When I saw my neuro she only increased my Sinamet she wants me to take 3 T daily. What is up with this symptom?