How to deminish my dark circles?

My dark circles have been KILLING me since I started wearing make up. I have had dark circles since I was a little girl it was caused because I have Hayfever. Now I treat my hayfever like I take Zyrtec when I feel a bit congested and I take allergy eye drops, but no matter how many creams I try my dark circles are still very much dark! And I wear concealer but my under eyes still look dark after I wear the heaviest concealer ever. I want to be able to cover up my dark circles with little to no coverage, please help! suggest anything like the best eye cream or diets or anything I need help like bad!