It’s a doctor saying that. More specifically it's from episode 61 of Hoshi no Kaabii aka Kirby Right Back at Ya!. More specifically King Dedede ate addicting snacks intended for Kirby. The living hell is withdrawal symptoms as the doctor says the only apparent cure would be Dedede never eating again.

For some context (10:50-11:40):

Dedede then orders evil Richard Simmons from the Holy Nightmare Company/NME

A living hell you say hmm?

This should just about cover it.