Really irregular periods

So I have a question. ... is it normal to have very irregular periods? So I have menstrual lime cramps around the time when I would normally have my period but I don't bleed. It's been at least 3-4 weeks since my last period but there have been times when I haven't had my period for 6 months... (I had my period around my sisters wedding 😕 and then 6 months later I had it again. ) How should I handle thins? I've tried eating better but that hasn't helped speed things up.. 😕😯😊