Think back to the hardest thing you have ever been through. The thing that felt unsurvivable at the time. The moment you were absolutely certain you would not make it.
You made it. You are here. You got through that, and it was hard, and you did it anyway.
Whatever you are facing right now is not bigger than what you have already overcome. You have a track record of getting through hard things, even when it didn't feel possible.
Trust that track record. You have made it through before, and you will make it through this too.