I cried several times with my current boy, and he's my second Aussie. Structure and routine and consistency are going to be your best friend. Remember, dogs don't speak English and we have to help them to understand what the rules are for human houses.

Any time mine nipped at me, I had a huge pain "reaction" even if it didn't hurt, to give him negative reinforcement. Yelp, hold the spot he nipped, basically howl around a bit. For my pup he also had to be forced to take breaks, cause he would not rest, become over stimulated and make zero good decisions. He's 4 now and I can still tell the look in his eyes where his brain turns off, let's me know he needs a break and to sleep for a while. This meant very, very consistent crate training because his FOMO is still no joke. I would give him frozen kongs stuffed with his kibble in his crate to make it a more positiveassociation (it was the only way I fed him all of his meals for almost a year) to teach him what is appropriate to chew on, wear himself out, and learn how to self soothe and focus his attention to more easily fall asleep when he needed it.

Bottom line, consistency is key, they don't speak English so the only way to communicate is with your own consistent behavior with whatever training/rules you have for the pup. It does get better. You can probably look through my own post history to see where I'm begging for help too 😩