I can understand how you feel, Maria. I felt the same way when I had Rudy neutered. I'm sure your furbaby will do just fine.
We picked Rudy up around suppertime that evening and he was out of it & sleeping all evening. The next day you would not have known anything happened to him.
Rudy did have the kind of stitches that the vet had to take out. Which didn't bother him at all to have that done.