Hi catastrophic
It would be good to hear more about your work.
It sounds like you are at both ends of a broken elastic band, and staying in bed stops it from snapping.
Is your employer aware of your depression?
Are they supportive?
Also, I often feel like I let my kids down, because I get so preoccupied with stuff in my head, and then seek time alone.
If this was a visible physical ailment, you would feel more understood, and people understand things they can see more, I think.
Depression feels real, but sufferers feel a fake in the eyes of others.

The stigma we fear stsrts with the silence surrounding mental illness.
My mum had severe PND after having me. I only found out a few years ago, from my dad, in my forties!
I wish I had known earlier.

What I'm trying to say is.... your children will understand the facts you tell them, but that there is a cure.
Besides, guilt is ever present for lots of parents, that's why toys 'r' us do so well!
I know I am a guilty parent also.