Hi ,I Am 21 And I Am Not Having My

Hi ,I am 21 and I am not having my period from last 5-6 months, its not for first time I missed my period, I started having irregular cycle problem after 1.5-2 years my periods started, I did took console to gynecologist also ,but what happens is my period is normal till I am having pills but once dose is done again same prblm.
And last time when I had my period it was very painful, i started getting pain 2weeks earlier my period.
I want my period back immediately pls help.