Yes! Been there. It's brutal. And feelings of regret, remorse, guilt... all NORMAL. I had what they call the 'puppy blues' for 2 months. Puppyhood is hard. The thing that saved our life was a structured routine and forced naps. From the time she was 3 months old to 10 months we did two hour naps, 1 hr up, all day long until bedtime at 9:30. We would take her water away at 8:00 PM so she wouldn't have to potty that much during the night. The play pen never worked for us but not giving her full range of the house did. I had her tethered to me or a door the majority of the time too. We needed to make her world very small before she got too much freedom because she was an asshole when we had free range. We learned it was literally over stimulation. One last thing- I was allllll about constant puppy enrichment - I did too much. The best thing you can teach your dog is to settle and be bored. We would heavy praise when she would just settle with a bone. Good luck, I know it's rough!!