I once had a thought that I was going to cut my own wrists, I'm not sure why I thought it, but think it I did and it scared the hell out of me. From that point EVERY time I saw a sharp knife this thought would come into my head and it would worry me sh*tless. Each time I thought it, the feelings got worse and it got to the point where I couldn't go into the kitchen in case I saw a knife. I would literally get this horrible feeling of dread and fear by just thinking about going into the kitchen, in case I saw a knife and so it got crazy enough for me to start avoiding the kitchen.
Now I lived alone at the time, which looking back was obviously a good thing, as I had to eat so was forced to tackle this thing head on, and it was being forced by the reasonable side of my brain, that I had to get in that kitchen, that MADE me realise, and maybe for the first time, what I had done. I had programmed myself out of the kitchen by my irrational fear of a thought that I may harm myself with a knife, there was no way that I wanted to harm myself with a knife, but somehow I had gotten scared of the idea, and what dawned on me was that I had programmed that, no one else, and somehow I had to reverse the process.
Now reverse it I did, by telling myself it was just a thought and that the thought alone couldn't harm me, it was my actions after the thought that were going to get me into trouble so as long as I didn't act on the thought and just let the thought go again I was going to be OK. Now guess what, I was, nothing happened, I remember actually seeing "the" knife in question and the thought rushing into my head, but then BAM along came another thought that said "don't be a dick, just drop the thought and you'll be fine" and you know what, that's what I did and WOW was that a eureka moment in my steps to recovery.
Now the same applies to you - don't worry that a thought is going to pop up into your head, because I guarantee you it will, especially at first, but what you need to KNOW is that as long as you don't act on that thought you'll be fine, as long as you can drop it again and put your attention back into the interview you'll be absolutely 100% fine.
So know that thought is going to pop up, know your going to get a little rush of panic, but KNOW that it can only do any damage if you stay with it, act on it, play with it, entertain it, etc. and so just drop it again by not giving it your attention and putting that (your attention) back into the room by listening to and watching what is going on in the interview, and not your mind, instead.