Dark circles often indicate kidney or liver so a kidney cleanse and/or a liver cleanse would probably be helpful. I know that when I eat chocolate and rich sweets the circles under my eyes get darker and my face looks tired, so much so that my husband comes home from work and sees immidiately that I have been eating something I shouldn't! So try to see if any foods react and contribute to your problem and then avoid them.
Both chocolate and processed (white) Sugar cause a great deal of tiredness and the dark circles for me.