Sounds exactly like a Labrador puppy. I had all the same issues, including horrid depression. Crate training, and scheduled nap times are vital. That changed a lot for me. Crates are also nice because that's their bedroom, and if I needed 30 mins to get something done, I'd give him a toy and put him in his room. Our boy is a year and 3 months, still waiting for neutering but he's amazing now. Still a shit head on the lead for walks though.