How To Induce Periods?

I am 34 and have had a history of irregular periods. Sort of Oligomenorrhea. Used to have periods about 7/8/9 times a year. At around the age of 23, I was told by respected gynaecs that i have PCOD and would be difficult to conceive. However I have 2 kids now. My periods got quite normal post the kids.
Have not had my periods for over 60 days now. checked for pregnancy but that's negative. i am experiencing all regular symptoms of periods since last 9days - like cramps & pains etc...but not getting it. Pls suggest how to induce my periods - OR can 3 days of Mensovit plus taken BD help (i have never tried it before)...