I know it probably feels incredibly nerve-wracking for you right now, but keep in mind that admissions committees expect nervousness - they've interviewed a lot of people over the years! They might have interpreted your nervousness/excitement as passion for the program and for the field, which is a really positive thing. You never truly know what they're looking for or what they're thinking, so don't let it get to you too much. I had a relatively similar experience with stuttering, rambling, not making sense, etc. except it was over the phone, and I ended up getting invited for the in-person interview for that program. It's not over 'til it's over. Hang in there If you feel like there were things from the interview that you could clarify, definitely send them an email like "I've given abc more thought, and wanted to follow up to say xyz" or something similar, and don't forget to thank them for interviewing you.