I know how you feel. I read, before getting Buddy, that if you put time
aside during the morning dedicated to your puppy it will help him adjust
better. I sit on the floor Mon-Fri from 6:30 am to 7:00am playing with
Buddy. It's our time. He is left alone 9hrs during the day while I work.
He has adjusted wonderfully. Today he is five and we still sit and play
for the 1/2 hr only now sometimes he goes back to sleep on me while
I drink my coffee instead of trying to drink it himself

It get's easier as they get older.