Dr. put me on Cymbalta for pain releif and fatigue. First day on Cymbalta wasn't so great...constant headache, fatigue, diarrhea and nausea. These are all known side effects. During the night I had great difficulty falling and staying asleep due to restless legs. I've never experienced RLS before the Cymbalta and searches on the internet haven't showm me much. Has anyone here experienced this?