Per The Miami Herald, the medical report detailing George Zimmerman's injuries was put together the day after he shot and killed Trayvon Martin. A few questions are finally answered:
The day after he killed Trayvon Martin, George Zimmerman went to a clinic with a broken nose, black eyes and two cuts on his head, but the physician’s assistant determined he didn’t suffer any head trauma, newly released medical records show.
Zimmerman declined to go to an ear, nose and throat specialist even though it was recommended, the physician’s assistant who attended him twice noted. [...]
The medical records document several injuries, but also state that the only reason Zimmerman sought medical attention was because he needed a doctor’s note to return to work, Duval County Assistant State Attorney Bernie de la Rionda said in court last week.
The black eyes were consistent with the nose injury, but he didn't need stitches for the two cuts on his head because they were already healing. He was also on "a variety of medications" for various ailments.
So to recap, he had a broken nose but no head trauma, felt good enough to avoid going to a specialist (ignoring advice, just as he ignored the "we don't need you to" follow Trayvon Martin advice from the dispatcher), and he only asked for medical help because he needed a doctor's note for work.