My puppy is acting weird?

I'm pretty sure my puppy has fully recovered from Parvovirus. His bowels are not runny anymore, and they do not smell like parvo. He gets moments of energy. I say moments because, he will get up and run and play and even beat up on one of the other puppys (playfully), but he still tires fast. And he still will not eat. He walks around the house aimlessly, and he will lay down for a minute then get up, move a couple inches and lay back down, and he does this process over and over again all day. He walks with his head down all the time, very rarely brings it up, which causes him to run into obvious things, such as walls, like if he never knew the wall was there. And he does not wag his tail like he used to. He cries all the time. Could all this be signs of neurological damage from the parvo?