Trouble playing high notes on trumpet?

I hadn't played for like five days.. (usually I play everyday but something happened where I wasn't able to.) And yesterday I picked it back up. I've been playing for about 5 years. I wasn't serious about it at first but I've got pretty good and I love it. Ever since I resumed my practice routine, I can barely hit high C above the staff and high D and E. Usually I can play very well with a nice tone to double G and I can squeak up higher. But I am not doing so well. Did I permanently ruin my range? What can I do? I'm freaking out-- I'm going to be a sophomore and after the required freshman concert band I'm in the highest band in school and I want to try to get first chair and band camp starts the end of July so I was hoping to show I've got better..