Welcome to drake ownership.

Wobbles is the same way; when he first came into season it was bite, bite, bite! Keep in mind, neutering may or may not fix his aggression. It will probably reduce it, but it may have not much of an effect at all. Also, a lot of vets either don't know or won't perform the procedure due to lack of experience. Barnyard specialists are pretty rare, certainly in my area, at least. I'm lucky to have a vet who specializes in ducks and chickens, but you may have to do some searching to find someone you feel comfortable enough with to entrust them with your scovy's well-being.
As for what to do in the here and now, well, he wants to mate. Period. There isn't much to deter him from that, other than separate him in a separate pen until his hormones die down, which obviously is not only tough to do inside the home but it can be traumatic for a lone imprinted duck. Have you thought about getting a female for him? That's the only thing I could do, in the end. I couldn't leave Wobbles alone because he'd get so upset when I left that he'd work himself into a frenzy and overheat. That can be deadly to a duck. So I got him a girlfriend.
As for stopping him from attacking you, lots of stuff seems to work for different people, kind of like hiccup cures: Everyone has a surefire method that only seems to work for them and no one else! With my Wobbles I was told to mount him...didn't work. Bill-tapping? Nope! Grabbing him by the neck? He takes that as a challenge. Throwing water on him? The jerk likes it! The only thing that's worked for me is when he goes to bite my foot, I gently flip him onto his back. He's like a turtle, he can't right himself. He hates it so much, and usually he'll go right back to bite mode when he gets onto his feet but after a few flips he'll stop an inch away from my skin and hover, weighing the pros and cons of it all, LOL!