Awesome! I interviewed at Midwestern AZ and Nova. I would suggest answering the question Why Optometry because all schools will ask it either directly or indirectly. They are looking to see if you have the passion for optometry, if you are Doctor material and if you have the perseverance to make it.
I heard back from AZCOPT in 4 days and Nova it took 2 weeks because of the hurricane, usually they respond in 1 week. Most schools will give you good idea when you will hear something.
Everyone is nervous no matter how they act or look and the interviewers know that. They are not there to grill you or interrogate you, they want to know who you are outside of the paper application.
Good luck!