regularly washing with warm compress & diluted baby shampoo, getting enough sleep etc will help to reduce much of dark coloration around eyes.
Unfortunately, there is no "good, fast treatment" that actually works. But an application of the right concealer (flesh-colored makeup) can temporarily correct the problem. See if you can get a demo at a department store cosmetics counter.
There is no treatment unless there is a medical cause. Endocrine abnormalities can cause dark circles.
People want things done fast too much these days. Being anxious and stopping is only going to keep the problem the same. I had success with Excel Skin Care's Serum, good product. I your eyes are really bad maybe look into using the eye product with one of their other peptide serums. Apply the eye serum and then one of the serums a few hours later for best results. I use their peptides everyday to keep me skin feeling and looking great.
They have a store on Amazon which offers the best prices.