PCOS HELP

So my period is about 15 days late (which isn't so bad) and I haven't been on metformin in a few months because my body really couldn't take it. Now I'm starting to worry though because I'm in so much pain with no period and it's been like this for a week. Any advice? I feel like their cysts being ruptured and I don't know what to do, lol. I feel like such a baby, but my graduation is next week and I'm trying to get my period before that. If I get it on the day of my graduation, I literally won't be able to go. 

Thanks! Have a great day everyone!