I started taking Celexa (SSRI) a week ago. I'm on a low dose of 10mg once daily. Lately, I've been having aching in my left hand and my left shoulder and I'm wondering if it might be from the Celexa. I awoke this morning to a lot of anxiety. My heart rate was way up and I was really shaky (I'm not usually like that.. even when I worry about symptoms, my heart rate doesn't usually rise). Has anyone experienced muscle aching during the first week of taking Celexa? Its not a generalized aching, just in a couple spots.... my hand and shoulder.