Flare up

My anxiety levels have been low for a while now.
I'm a new person.
Yet the flare ups send me straight back to square one.
Paul is away from me until Monday.
He is flying to Berlin with his dad tomorrow and I'm getting worked up.
I have never been on a plane and they have been the subject of many nightmares over the years.
I'm getting really upset and panicky just waiting for the news that the plane has crashed.
They haven't even set off yet -.-
Why does a worry end up becoming, what I believe to be, the only possible outcome of the situation.
Therapy doesn't help right now.
I don't think anything does.