I have been taking 150mg of Zoloft for the past 8 years. For the past three years I have had very little energy or motivation. My sleep clock is screwed up something terrible (maybe 4 hours). Even if I sleep 12 hours, I don't feel any better. I am depressed that I feel this way. What can I take or do? I have had blood work done numerous times. Everything is normal. What can I do?