Rob, 28, was diagnosed with a form of the disease diabetes when he was rushed to the emergency room earlier this week.
But despite now being back home, Rob is said to have retreated further into himself and is refusing to see any friends or family, reported Radar Online.
"Rob does not want to see anyone and he has made that very clear to the whole family. He is not answering calls or returning anyone's text messages," a source said.
Rob's mother Kris Jenner was on vacation when her was taken into hospital but is said to be rushing home to be on hand to support her son.
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