Male bun acting as if expecting bunnies?

Hello Rabbits Online Friends!

I got my Toby neutered about a year ago. However, there's a chance he may still have one because I did not feel comfortable with the vets opening his abdomen to check if there was another or not. He has been doing great, but last week, he built a nest and ripped out fur as if expecting bunnies. He made one again last night, and now, he is acting very hormonal, trying to guard his nest, and he won't eat his yummies that he gets every morning (carrots, apples, and lettuce). I'm worried now, because it is bad when they stop eating. Will this pass, or is there a more serious issue here?

Update: We took him out of his pen to see if he would relax, and he is eating a carrot. I'm still concerned though.

I have no idea, sorry, but that sounds really odd I'm sure that someone will come along and help.

A buck nest making???/ And then guarding it? wow...that's a total new one for me.
And he is neutered?
And definitely male?

hmm... something odd going on there...

Okay, that's really weird. Even if he still has one testicle he wouldn't be acting like a pregnant doe. Maybe he's a hermaphrodite?