Puppy blues is real – help!

Hi all, I am posting for the first time as I am getting desperate.

Background

My maltipoo puppy just turned 15 weeks old, and I just brought him back home for 2 weeks. He is not completely vaccinated yet, so we can’t bring him out for walks or potty train him outside. We live in an apartment and his current set up is a 120cmx60cm playpen, with his 60x50cm pee tray within.

I work from home on most days, generally keep him inside his playpen most of the time so that he can nap and learn to be on his own and not have separation anxiety. I usually let him out during only 15-20 mins exercise time, socialisation time, daily wipe down+hair brushing.

Challenges:

1) He is quite good with not waking us at night, and generally accurate with his potty (8 out of 10 times will pee in tray, and poop is so far accurate). However, I noticed that he LOVES to lie/sleep on his pee tray, even after finishing his “business” on it. This makes me anxious especially on days I need to go into office or during bedtime over night. He steps around and even sleep on his poop! I can’t even shower him often as it is not good for his skin. Should I downsize his pee tray so that it’s not as comfortable for him to lie on it? How should I transition him outdoors when he is vaccinated?

2) He is super excited everytime he sees me, which I should be happy that he bonded so quickly. But he is constantly barking murder, zooming around or jumping on his hind legs within the playpen. This makes training him to do anything very hard – like training his name, training him the command to sit etc as he cannot seem to calm down. Everytime he is out of playpen, he will zooming around too

Bringing him home was my decision and my husband wasn’t super keen of it then. Therefore I feel like the burden of caring for him falls solely on me. I am tired of constantly cleaning him up and wiping him, washing his stuff to keep it hygienic.

Training him is also exhausting as he cannot calm down when I go close to him.

I broke down and cried a few times trying to provide care for him the past two weeks, and as horrible as it sounds, I caught myself regretting the decision of bringing him home a few times.

Can someone please give me some advice?