I'm Doomed lyrics

Howard: We gotta do two shows tonight?
Dick: Yeah, I hope you don't use up your vital . . . statistics
Howard: I'm doomed. Two shows, man . . .
Dick: Never two shows important, I mean
Howard: Couldn't have spared me another twenty minutes sleep, another three hours worth of sleep, coul have driven down?
Dick: I cut it to the bare minimum, Howard
Howard: Yeah, man, you're O.D.'ing on Preparation H at this very moment

Submitted by Guest

What do you think is the meaning of I'm Doomed by Frank Zappa?