So, the riddle as it were is how can medicine and sickness not be two aspects of the same thing, and also not not be two aspects of the same thing? In Zen, we call this a koan.
I'll give you a hint: if you say they are not two aspects of the same thing, you're essentially calling them two separate things, and a true understanding of the universe is to see that all things are an interconnected and seamless whole, with no differentiation between this and that, including medicine and sickness.
To say that, yes, they are two aspects of something else is to still conceive of a "something else" and to fall into the trap of distinguishing self and other, even if that other is an interconnected and seamless whole.
You take it from there: if medicine and sickness heal each other, where do you find yourself?