What Is The Treatment For Severe Hair Loss?

My hairs are falling & the new hairs which are coming are grey in color.. Actually i took I-PIlls approximately 10-12 In nos.. because of whicg i had pimples & acnes on my face, Scanty Menstrunal Cycle.. (menas blood flow was scanty) & hair Fall.. Now the other things are fine like my acnes have gone & menstrunal cycle has become normal but hairs are coming grey Kindly suggest something