Overly imbalanced???

Rylie • Just an over worked and underpaid 19 year old college student.
So exactly a week ago today I had to take Plan B after coming home from a vacation. I went and visited a friend at her university and since I've been back I've been overly depressed like I was a few years back when it was really bad. I've been very happy and content with life but everything this week just feels like pure crap and nothing is going right and I'm not happy at all anymore and just feel like I'm stuck in the deepest hole on earth. Not only this but I'm on my third day of my period. Someone please tell me this will pass and the real reason of why I'm feeling all this. Are all of my hormones just super off and crazy?? Or is it just me?