Irregular Periods and painful PMS

Hi, I am Kayla, 17 year old girl.

I've been having irregular periods since the first time I got my period (when I was 12), and as time passed, it gets worse!

Last year, I only have 3 periods, and have a very bad PMS. A month before I got my period, I had bad throbbing headaches for one month, nausea if I smelled something weird, couldn't sleep, and my body ached all over. And my period only last 4-5 days.

Is there something wrong with me? Am I fertile? Can I have kids later?

To be honest, I am scared, because my mom always has perfect menstruation cycle..