Question about だの(?)

Question

I hope it’s fine if I post a picture of a manga I’m reading here:

Chapter 6, Chainsaw man 1

The boy lost his pet (it died) and it became his heart.

The phrase she says in the bottom there is tripping me up.

心{こころ}の中{なか}にいるだのなんだのは浅ましい{あさましい}慰{なぐさ}めじゃ！

I think it means:

«As for him living in there, its useless comfort»

I suspect it’s だの (and~) grammar but I know that なんだ is a different thing by itself. What is going on here?

Answer 1

According to Imabi, なんだの is simply used when the speaker can only think of one item to include in the list that だの creates, in essence, making it 'Xs and whatever else'. The context thus lends itself to the following interpretation:

Whether it remains there or not, that's little comfort!