The viva is important. Passing is important. Lots of things in life are important.
Getting your dream job.
Passing your driving test.
Publishing a book.
Being on TV.
Finding true love.
Living a long and happy life.
Going around the world.
Seeing falling stars on a summer’s evening in the middle of the French countryside.
Watching a dust devil swirl and twirl.
Seeing night turn to day in the middle of an intense electrical storm.
(seeing the previous three things on one holiday!)
Finding a problem.
Finding a solution.
Being a parent.
The viva is not the most important thing you will ever do. Wouldn’t it be a bit sad if it was? That would mean everything that came before, especially the research you did, would be a bit blah in comparison. And the same for everything that comes afterwards!
Let go of your viva being the most important thing ever. Then you can find and focus on what really is important about the viva, and get past it to whatever important things come next.