hello doctor i am 29 years old.i am suffering from depression since 2008.psychatrist started me venlafaxine 75 mg twice daily but no improvement then switched to sertraline 100 mg.sertraline improved my mood but i was feeling low energy and fatigue i was sleeping all the time .then add on medication tried are bupron150 mg pramipexole 0.375mg and another two types anti psychoactive but no improvement. then doctor again changed to prothedein 150 mg its increased my energy but effects are not sufficient for me.my psychiatrist told me that give advice of senior doctor.i am doing exercise of cycling for 1 hour daily at evening.now probles is that i cant do my daily work.it very hard to do small work for me.i have no productivity.i am wake up at 10 a.m. . then sleep at noon 2pm. for three hours .after again wake up 5 pm.it my daily routine. at noon it very hard to me to keep awake .i tried awake at noon. but its not possible for me.now my sadness is completely gone.exercise also improved my mood but slightly. i have checked my thyroid and vitamine b 12 test which are normal.please give me advice.