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Did your physician do EBV (Epstein Barr Virus) titers on your blood ?
I would definitely consider getting treated for your depression and seeing if your symptoms improve. Depression can most certainly cause you to be fatigued.
The only other suggestion I have... is if you continue to experience fatigue after all of these tests and treatment for your depression symptoms (if your physician & you feel that is even necessary)... then check and make sure that your physician tested you for Epstein Barr Virus. If you check out the link below, you will see that chronic fatigue syndrome is a usual suspect in people who have had mono and have been having extreme fatigue for over 6 months. Please take good care of yourself and get some rest... your body is asking for it.
http://www.cdc.gov/ncidod/diseases/ebv.htm