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But why? Why do you panic?

Why are your body or subconscious convinced you are about to enter a stressful, risky situation and start to react this way? What conditioned them to believe this?

It happened to me too by the way, both the night before and during the interviews, and what I walked away with was the realization: I disliked expectations.

I didn't want to be interviewing, or working for someone else, or generally doing what I thought I was supposed to be doing. I needed time to get on a path where I would be doing what was right for me.

If nothing was expected of you, and there were no restrictions (financial, societal, etc.) on what you could do, what would you rather be doing? You said in another comment you are pretty good at what you do, so could it be that the problem isn't you but the general idea of expectations?

How would you fight this without drugs?