Crazy Period! HELP!


Sooooo I’m 15, and lately for the past 8 months my periods have been so abnormal. The first two months I would be having my period twice a month. The next 4 moths I only had my period twice. Last month my period came early. And now this month I’m on my period for 12 days today is the 13th day and I’m not sure what I should do. I’ve also been feeling really weak. And today I feel very dizzy.