First, I must mention that it sounds as if you have a wonderful, caring vet. I think it great that she called and offered to monitor Buddy for the day. They may pick up on something that you aren't seeing.
Second, please know that we are all praying for Buddy and you. Hopefully, you are getting the rest you need to carry you through all this.
Just know we are here for you.
Fear not Brothers and Sisters! I have read THE BOOK..........we win!!!