Separation Anxiety

I'm leaving Haven today for the first time EVER. She is nine months old and I've never left her for more than 2 hours before. I have to go to OKC with my teachers and Haven will be with her Daddy for about 7 hours. I know she'll be fine. I don't know if I'll be fine. I've already had a couple of crying spells and we haven't even left, yet. What will I do when it's time to leave her over night? We have teacher's convention Oct. 20th in Tulsa that all staff are required to attend to maintain our accredidation. I can't even think about it. I'm having separation anxiety!