Songs About Health Conditions

Knockin' On Heaven's Door:  Dylan  (assuming being shot and in the process of dying qualifies as a health condition)

Something For The Pain - Bon Jovi

Weird Al Yankovic - Fat

The Big Hurt: (Miss) Toni Fisher

Good Lovin': Rascals (he was feeling so bad; his family doctor, presumably a licensed MD, said he needed some good lovin'; he told his girl that he had the fever, but that she had the cure).

Bottle Of Wine: The Fireballs (alcoholism)

How can you mend a broken heart, Bee Gees

Dizzy: Tommy Roe

Image Of A Girl: Safaris

Tossin' And Turnin': Bobby Lewis 

insomnia

Classical gas, Mason Williams