Need some puppy advice!!

So this isn’t my first doggy but this is my first Aussie. His name is Cosmos. He’s about three months old and has been honestly quieter than most puppies and pretty decent at house training so far. I’ve been socializing him a ton and he’s already great in the car now. I took him to my boyfriends and he did great. He hardly had any accidents and didn’t cry when we put him in the crate for naps and night time. We stayed there for a week, but now that I’m back home he’s crying being put in the crate and when I leave for only a couple seconds he’s screaming. I know he’s probably confused but how can I alleviate his anxiety. We are also moving again in about two weeks. (I know it’s not good timing but I was also surprised with this bundle of fluff). Any advice is greatly appreciated. EDIT: he’s also peeing everywhere 🙁 I have another small dog (mini golden doodle) and I think it must be a territorial thing? I take him out every 30-min -hour and always after eating, and he’ll still pee inside. I use an enzyme cleaner to get rid of marking smells but I’m trying to figure out how to get him to stop. Also he’s difficult with letting other people take him out, he will only really go with me. I feel like he was doing so well and now I’m failing 🫩