I am in a similar place. New puppy, rhodesian ridgeback, joined the family on 22 December after we lost our old 10 year old dog in August. We are doing better, but the first few weeks were exhausting. I had completely forgotten how much work they are! On Monday evening, 3 weeks ago, I was in tears on the phone to a friend saying that I did not know if I could do this or if our marriage would survive. But I think we are going to survive, just! This morning, I had to crate him just to have some "time" with DH - sorry, too much sharing!
Puppy is 13/14 weeks old now, sleeps through in crate from 10.30pm to 6.30am and has not had an accident in the house for 2 days. I have to say, most of the accidents are probably our fault, not reading the signs, but we are getting there.
The only thing that is driving me insane is the nipping. I always have something to put in his mouth instead of my hand/leg/trousers/boots/toes, but it still seems incessant. I know when he gets really bad it is usually because he needs a nap, so he goes straight into his crate.
We are walking him more than the recommended amount, but vet is comfortable, and we are not running, jumping, etc... Twice a day for about 20 mins. I just think he needs to get rid of the energy. We have more chew toys for him that our old dog ever had, the best ones keep him going for ages - elk bone and reindeer horn. He also loves the treat ball and rolls it all over the house for ages. So far so good. And he is learning to use the stairs, because he is now nearly 26 lbs so we cannot carry him as easily any more. Training is going well, he can sit, drop and paw on command, and he is walking on the leash well. It is amazing to have a dog that is food motivated, as the old dog was not very good with food at all.
Sorry - this is an epic post, but I am so relieved to find people going through similar things.