How do you write a god that feels/is going mad

How do you write a god that feels/is going mad

So I was just going over and explaining the cosmology/Cosmonogy of my universe, I told my friend to critique anything valid that he can and ask questions about yeh stuff I tell him.i told him that the original creator of the universe a perfect being was going mad, insane due to his perfection, he's reached his maximum potential and has no room to grow or anything, he's omnipotent but not completely Omniscent.

And then the question that stumped me

\* "if he's perfect, how is he going mad? Does he have a human brain? If so how is he perfect?"

And..that makes sense...and I'm confused on if I'm like missing some magic puzzle, if anyone sees this please help,I've tried thinking of numerous explanations but I haven't been able to come up with something