Moody as hell?

So my period is tomorrow, and I am HELLA moody today. I've gone from feeling tired and blah, to hyper and happy then to having a panic attack and crying, to angry, and then crying again. What the fuck is with my hormones??? They've never been this bad before, and I don't have any pain or anything except for maybe a headache earlier in the morning and some nausea. Help!!