Don't sweat that the nomination hasn't been filed on the admissions server yet. Some congressmen send their nominations to the academy before they notify the applicant. In my case I found out by letter before the website from Sen. Coleman but my nomination from Rep. Oberstar was online before I got a letter.
Relax a little bit, enjoy your senior year. Memories like that help get you through the tough times here, there have been a few nights i've just looked through pictures as a way to unwind.
Congratulations on getting a nomination, hope to see you on the hill!