It sounds like normal symptoms to me. Every month can be different especialy with PCOS. And also being young. If your taking any new meds that can also be a cause. Good luck!
Seems normal. I just had my period this past weekend...and the second day of it I did nothing. I was so tired and whining the whole time. I felt so sleepy and lazy that I took like 3 naps during the day! Hormones change throughout the month and month to month. If you just have this extreme tiredness on your period, then I don't think there is much to do on it. But if your tired all the time, then I would get checked out.