I read this short story in a sci-fi anthology probably between 5 and 10 years ago, possibly one of the Year's Best SF anthologies. It's set in a world where psychic powers are common, and people with psychic abilities form an upper class over the non-psychic lower class. Many people make a living using specific psychic powers; for instance there is a floating restaurant that employs several hundred psychics to keep it levitated.
The main character has an illness that causes him to gradually lose his psychic powers. He somehow gets in trouble with the law and goes on the run. During this time he also makes contact with the disembodied mind of a powerful psychic who helps him.
Eventually it turns out that his illness was part of a metamorphosis and he ends up with more powerful psychic abilities than ever before. The disembodied mind proves to be that of the original inventor of psychic powers, who accidentally severed his mind from his body many years before. The main character helps him get back into his body, which has been maintained on life-support all this time.
Does anyone know what story this is?