I just got a book from the library 6 weeks to better skin . In it, it suggest trying products with Eyeliss in it,
which helps with dark circles.
Also you might try lymphatic facial massage. I had an instructor tell me when I was in school (years ago went to Phoenix Massage Therapy College) that she would do lymphatic massage to her husbands eye area and face and it really helped with getting rid of the dark circles. I am sure you can call the schools and see if the students provide such a service for a discounted price.
Good luck and keep us posted with results