Mine's gone this week--just one week and I feel anxious and sad. Four weeks would send me into a tailspin. I totally understand the childlike feeling of abandonment, but instead of my adult self being shaming towards that child part (my mom would have completely shamed me), I'm trying to comfort and empathize with that child part.
Notice that I said, "trying."

It's hard to give yourself something that you never got from your caregivers when you were a kid. So I'll keep working on it, and I hope the time goes quickly for you.