Very scared for interview

I'm going to my interview in two days and honestly I'm scared s***ing myself because I might stutter like an idiot when I answer the question and I can't memorize my interview lines, like I get mixed up and stuff. I even blanked out a few times during my mock interview and I don't know what to do. This isn't like a job interview where I can freeroll. Can anyone relate? Advice?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums