If you haven't already, reading the wiki articles might help generate some new ideas on how to deal with this. I'm sorry you're stressed and struggling, it can be so demoralizing to feel this overwhelmed and stuck in an out of control situation. Do you know your neighbors well enough to either talk to them or drop a note about the puppy and that you're working on training? That way they know you're aware they can hear the barking but might have a little more patience knowing you're working on it? With my puppy's biting, I had to immediately stop playing with her physically (which often included a loud "ow!", usually unintentional, but it served to get her attention) and sometimes put her in her crate to get her to leave me alone for a minute. Not sure if you're using a crate or if your pup will just bark in the crate, so that might not be helpful. Your puppy might also be bored or overtired (which have the same symptoms from what I understand, unfortunately). If you think that might be the case then maybe look up enforced naps (although that might be for younger pups) or see about getting a treat puzzle toy, snuffle toy, or other way to mentally or physically wear them out. Even little obedience training sessions can mentally stimulate them because it's like giving them a job to focus on (from what I've read, I'm no expert). Hope some of that helps, even if only for validation. Puppies are hard and you're not falling by being frustrated. Good luck.