The 28-year-old, who was rushed to hospital this week after falling ill, has morphed into a recluse since leaving hospital and refuses to see anyone.
“His pancreas is basically not functioning,” the family insider told Radar of the overweight former reality star, “He also has kidney problems. He’s very, very sick.”
A source added: "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."
The only person Rob has seen is his sister Khloe, according to reports, as he lives with her.
While Rob has apparently taken the diagnosis as something of a "wake up call", he is still unsure about the prospect of entering a rehabilitation facility – something his family are reportedly keen for him to do.
The source added to RadarOnline.com: "Of course Rob is scared right now and he should be. His health is the worst it has ever been and, diabetes aside, he has to overcome the mental health issues that seem to be at the center of all of this.
"Everyone is urging him to go to rehab, whether it be a physical rehabilitation rehab or a drug program.
"The kid needs help and if he does not get the help he will not be around to see 2017."
Rob's mother Kris Jenner was on vacation when he was taken into hospital but is said to be rushing home to be on hand to support her son.
Most Shocking! #Rob Kardashian diagnosed with 'serious kidney and pancreas problems'
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