I've been in your shoes and a lot of people will critisize you for feeling that way and just don't let it get to you. Here is my advice: Yorkies requires lots of exercise so, try walking him until he seems tired (Cocoa can go for a mile or more). Cocoa also started calming down just recently and he is almost a year old. I think they just have so much energy and are very very playful. Once I got Daisy all they do is play and that has helped a lot too. They keep each other company and get lots of exercise by running around and wrestling. Trust me, it will get easier and if you do end up rehoming him that is ok too....it doesn't make you a bad person.
I wish you the best of luck!!