Hugs to you. I know it is hard; also been there, done that. Try not to let the kids see you cry. It's okay to let them know you are sad, but do your crying in the shower.
Also, I cannot stress strongly enough....move the money in your joint accounts. See a lawyer right away about other accounts, such as 401k, etc. In my case, because it was his name only on the retirement accounts, with me as beneficiary, he was able to empty them out. Also, get advice from a lawyer regarding any joint bills in your name, such as credit cards. You don't want to be responsible for the entire totals, and you don't want him to charge your credit cards up for things like furniture, etc.
As for disney, if it is paid for and you can swing it, do it. It will be the first of many things that you will do that will amaze you. That was the positive side of the whole experience for me...I found out that I am one strong woman, and you will, too,regardless of the outcome. I hope things work out for the best. Oh, and I agree with the poster about leting your child's school know.