How can I stop this?

I have so many things whirling around my brain. Everything seems to upset me. Things I can't control. Things I have absolutely no say in. I just want some peace but I don't know how or where to get it. If there was only a switch you could use to switch your mind off sometimes. I've got something going on that I've been worrying about and it will be going on until the end of October. I wake up worrying about it, worry about it half the day, and go to bed worrying about it. And, again, it's something that I can't really control, it's going to happen whether I worry about it or not. But it's about someone I admire very much. I don't know them personally but I do admire their work and I so want the best for them. I know if they knew I was losing sleep and driving myself crazy worrying about this, they would be horrified and tell me not to but I tend to be obsessive over things and this is obsessing me right now. I just want the next six and a half weeks to be over so I can stop worrying about this. But whenever my mind has a quiet moment, it inevitably returns to thinking about this. I can't do any of the things I used to do. I can't read or write stories or watch movies, nothing I used to love to do interests me anymore. I'm driving myself around the bend worrying. And I don't know what to do to stop it.