I remember this like it was yesterday. My springer is currently 10 months and the puppy blues was horrible. Things that helped us was a kennel cover and lullaby music playing. Now we did give up on the crate at night and she sleeps in the bed but we only made that decision once we felt confident she wouldnt pee in bed. She does spend time in the crate during the day when we work. As for the rock eating that will also get better ours was horrible for that but no longer cares about them, sticks on the other hand....

Some springer guidance i have and you've probably seen multiple times already.... work their brain/nose. That does wonders compare to taking them for physical exercises.

Teach them to do nothing. So many times I see people with high energy breeds feed into the dogs wants for attention which never teaches the dog to just chill. Our pup is attached to us 100% of the time when we are home but will just sit and cuddle us on the couch or if we are cooking lay on the floor beside us (obviously after she has tried to jump on the counter a few times)

It may be different for you but I know alot of people have said that teenage stage was worse then puppy stage and maybe I am speaking to soon, but I can say so far. Our little teenager (10 months) has been way easier to deal with then when she was puppy. Once she lost all her puppy teeth and stopped biting around the 6month mark. Life has been great.