Anxiety is keeping me from falling asleep?

I have pretty bad anxiety and always over think things. I don't like to get my hopes up because I'm usually disappointed. I also have terrible insomnia. I am in eighth grade and yesterday we found out if we were eligible to attend graduation. This is based off grades and attendance. My attendance record isn't the best. But the councilor always tells me I have amazing test scores and always compliments me on my academics. I was absent when we found out about graduation, so I don't know if I'm eligible or not. If I'm not eligible tomorrow will be my last day! I have so much anxiety and I can't sleep at all. How can I deal with my anxiety and stop thinking the worst of the situation?