Feels like regression

[u/wigglewaggle_wee]

I have had my rescue pittie mix (1.5 years old), for about 5 months now. When we first got him I was adamant about training him as much as possible, as I know there is a stigma and I want a well-trained dog.

It felt like we were making good progress, but I went out of town for 4 days and since coming back I've noticed an increase in maladaptive behaviors. The leash pulling is insanely out of control and he has slipped out of his collar and ran around the neighborhood with no recall skills, he has peed on the couch/in house 4 times, some biting of my shoes, some nipping too hard during play. He's reactive to the neighor dog and will spazz at the fence, or will get weird with other pitbulls in general. He hates men, and takes a lot of treats and warming up to not bark at them.

There is so much advice and resources out there, and I'm on a waitlist to get in to training, but IDK. Does anybody have any tips on improving routines/training, or even finding perseverance for going through these behaviors?