The viva is most likely the final challenge of your PhD. Corrections are work, but in most cases they’re simply editing or amending what you’ve already finished. The viva is the big thing you need to focus on and get ready for.
So prepare. Find out what’s involved. You have a lot of skill and knowledge when you submit: you need to know how to apply that to the challenge. You need to know what the viva is all about. You need to know how you can be your best in that situation.
You’ve risen to so many challenges over the course of your PhD. You can rise to and succeed at this final one.
Take a little time to get ready. That’s all you need.