Freaking out before interviews

Hello fellow medicine freaks!! So I currently am stressing out to no end before my lanc interview tmr. I feel like i dont know anything but i know everything if you know, you know. I’m also worried that because I have pretty low-masking autism, that when I don’t make eye contact, or my tone of voice will go all weird, that it’ll be deductible. Everyone, including the uni, is aware that I have autism, and when it comes to role plays I have managed to mask everything well enough. Honestly this just stems from my head of science who said I’ll never get an offer because they ‘won’t be agreeable with autistic traits’ but every other person I’ve done interview prep with hasn’t even mentioned it.

A) how do I decompress before my lanc interview tmr so i don’t have a massive brain block? B) will being autistic impact my interview as much as I think it will?

Lotta love

(Ps ignore the vile grammar i cba to be proper rn)