I’ll do whatever it takes, when I’m with you I get the shakes
My body aches when I ain’t with you, I have zero strength

from Eminem – Space Bound Lyrics on Rap Genius

Meaning

What love can do to one physically is the song’s big theme.
Love is a drug so like almost every other drug there are symptoms when you are not on them like the DT’s with alcohol withdraw which cause you to shake and heroin withdraw physically drains all your energy and leaves you hurting. That’s why Em calls them sucubus.
Symptons addicts experience when they don’t have their drug—the album’s big theme being “Recovery” and all.

Maybe, here’s “zero strength” — also playing on Space-theme?
i.t. zero gravity.
Without Space bound Eminem have zero gravity.
Huh?

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