I found that I had extreme fatigue when I was depressed. It could still be part of the depression. Or it could be the effects of your medication.
I hope you feel better soon. My fatigue went away when my depression decreased.
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Bipolar I, Depression, GAD Meds: Zoloft, Zyprexa, Ritalin
"Each morning we are born again. What we do today is what matters most." -Buddha