Hi, my Mom was recently diagnosed CFS and they gave her Elavil. Her appetite increased and she gained weight rapidly in 2 weeks time. So she told doc she couldn't take it anymore. She already had problem with weight management she didn't need help with putting on pounds. However, she cannot sleep well at night and she can't seem to wake up during the day; she takes melatonin but that's not helping-she either sleeps too long or not long enough. Mom also has FM pain that the doc says to manage with exercise. After exercise the pain subsides for about 2hrs then the fatigue and pain descend again. Is there any anti-depressant or other med that will help my mother sleep and ease pain WITHOUT weight gain? Please help me find one.