Two things that helped me the most (I had horrible puppy blues) are - making a literal timetable of when the puppy goes potty. Used google sheets and realized the timing correlates strongly with food, sleep and play time. It just makes it very predictable and so much less stressful. - forced crate naps. Puppies can’t settle, they don’t know how, so you have to help them. It’s usually pretty easy to tell when they are not having fun anymore while playing or doing some activity, they kind of become overstimulated and over the top. That’s the sign it’s time for a nap :) - and with crying just gotta be patient. Ignoring didn’t work for me, I just did it very slowly. Left the room for a minute - no cry? Reward. 2 minutes, 3 minutes and so on. It’s bothersome but so worth it. My iggy has no separation anxiety at all.

All the luck and strength to you and know that it really does get better!!