Sounds like you need some backup. Book yourself a couple of counselling sessions, before and after. It’s probably not so much the interviews themselves that are worrying you, but needing to remember negative things and drag up emotions you’d rather forget. There’s help for that.
Reliving past hurts is never fun, but there’s a real upside here. The perpetrator might be brought to justice, and it’s also an opportunity for you to deal with the trauma rather than suppressing it. You might be surprised at how positively you deal with all this. You might come out proud of yourself, and with a new confidence. You’re not the person you were back then. You’re older, wiser and probably see things quite differently.
On the practical side, why not try setting up a time for yourself to ‘properly remember’ this incident. Nice cuppa, somewhere peaceful, something to look forward to planned for after, notebook in hand. Write down any snippets you recall, and after 30 mins say to yourself ‘well that’s ok, I’m done for today.’ And put it aside in your mind until the next session. Like opening and closing a filing cabinet in your mind.
Good luck, you’ll be fine.