doctors make the worst patients

be one's own worst enemy

To act contrary to one's own interests; to cause problems for oneself; to self-sabotage.

cannot make it

Cannot reach satisfactory or expected standards or do something competently; describes someone in a hopeless situation.

enough to make a cat laugh

Very outlandish or outrageous.

enough to make the angels weep

Something so distressing that it causes one to lose hope and faith.

fine feathers make fine birds

Something that appears beautiful or good is by definition beautiful or good.

good doctors

plural of good doctor. An honorific form of address to a group of doctors.

in the worst way

Urgently; desperately; to an extreme degree.

it takes all kinds to make a world

Diversity is essential: the world would be incomplete if everyone were alike; an expression of surprise at a person or people's eccentricity.