I'm sick as a doctor's patient
Sick meaning good/great/talented. If you are a doctor’s patient you are sick in the literal sense.
It is likely that every rapper EVER, has made this analogy at some point in their career.
To help improve the meaning of these lyrics, visit "Rocket Ships" by Talib Kweli (Ft. Busta Rhymes) Lyrics and leave a comment on the lyrics box