Over the last 3 weeks Ive hand random twitching in the index finger of my right hand and left thumb. My arms have started feeling week and shaky. Like Ive been weight training all day without a break. I ve also noticed a lot of clumsiness in picking things up or holding, reaching for things. At the end of the day Im rather quite exhausted, Ive been noticing that when I first wake up I feel good but withing an hour Im back to where I was. I am taking Effexor and Mood Stabilizers and I don t know if they effect the nervous system at all.