“Anticipatory anxiety” is the anxiety one experiences before starting a challenging  activity.  Most often, anticipatory anxiety is a lot higher than what you actually end up experiencing.

Why do we experience anticipatory anxiety?  I think it’s because the panic response is over-zealous about doing its job:  trying to locate any danger, in order to protect us.  When it can’t find any danger in the present, it looks into the future.  Sometimes, the only possible “danger” it can find is something you haven't done yet!  

Each time you actually start the new activity – bringing the activity into the present – the anticipatory anxiety fades away.

As you continue to do your healing work, the anticipatory anxiety will gradually lessen on its own.