Been there. I've had dogs all my life, many of them puppies. I've volunteered at the shelter, worked in a vet office, even taught training classes. I knew dogs, right?
Then came Mr. G...adorable puppy from hell. He had separation anxiety, could not be crated, would not be housetrained, never slept, and screamed bloody murder whenever I disappeared from view. I also had three other dogs, two of which had serious health and dementia problems. I found myself googling "my puppy is an *******" in the middle of the night.
After three months of no sleep and never even sitting down for five minutes, I had lost seven pounds, had troughs under my eyes, and tended to jump and burst into tears at loud noises. I then contracted shingles that put me in the ER on morphine.
Good times.
So I really, really get it. Some puppies are just insanely high maintenance. The good news is that he has turned out to be a wonderful dog and we all survived.
But I feel your pain, I really really do.
Sending you a hug.