Of course you are nervous, a completely normal reaction. That doesn't make it easy however. My thoughts are with you, but maybe you might want to do some mind body connection stuff to help you through these tribulations. In the meantime, perhaps deep breathing, or meditation, praying, yoga, taichi, music therapy, anything that might help you to calm your mind until you get back to your old self.
I use wild devine guided meditation software and music, some praying/med as well.
Best wishes to you,