amenorrhea and PCOS

An

Has anybody had this problem too? i was diagnosed with PCOS 2 years ago, my doctor put me on birth control so I take them 6 months then I stop (my doctor said taking it for too long can affect my fertility later on) but every time I stop taking them I get my period the first month as always then suddenly it stops for 3-4 months. Anyone else with that problem? Does this affect fertility to just not get my period for several months?