Darkness of eye lids may be due to allergic to some cosmetic you may be using. Find the cause whether it is due to night time awakening or some cosmetic you are applying under eyes or it is just effect of light (Tyndall  effect)or it is hereditary. Take plenty of fluids, sleep at night at right time. Apply cetaphil moisturing cream around eyes in day time & Fixderma under eye cream at night on dark circles for 3 months. 20 % to 80% improvement depending on the cause.If there is no improvement ,consult dermatologist with MD or DNB Dermatogy qualification.For itching in eyes you may use Tobrasone eye drops 3-4 times & genteal eye drops 4-5 times for a week at least.

U may have allergic conjunctivitis. It is treatable with eye drops, so please consult an ophthalmologist because type of medication will depend on the severity of the problem which can only be ascertained after examining your eye.