A cutie pie like that? No way. I don't believe it!
I don't remember the exact ages, but puppies do go through stages where they test their boundries. In dog years, he's now an insecure adolescent who lives to make his mother miserable.
For the potty training, I would suggest boot camp. You are lucky that you didn't have to do it before. If he already knows what to do, restricting his freedom will probably motivate him to re-learn very quickly.
Have you tried pennies in a can?
I'm kind of guessing here, but I wonder also if he (understandably) got pampered after his surgery. Try setting firm boundries for him. Unprovoked biting is UNACCEPTABLE, and warrants a five - ten minute time out. Is he really biting you, or is he play biting?