Rob Kardashian had a major health scare over the weekend, which found the reclusive reality star in a hospital emergency room!

Turns out, Rob wasn't feeling well, got scared, and hoofed it to the ER to be checked out and he left the hospital with a frightening diagnosis -- diabetes.

Kardashian has struggled with his weight for years and has stayed out of the public eye in recent years as his condition worsened. He had recently been preparing for a "comeback," according to reports. Kris Jenner said her son dropped 50 pounds and was doing well. But apparently he regressed -- perhaps with news of BFF Lamar Odom's overdose and subsequent hospitalization.

Rob has type 2 diabetes, which can go into remission with the proper diet and exercise regimen. Sis Khloe Instagrammed a selfie with the caption "Melancholy." Perhaps Rob's biggest supporter, KhloKhlo has, for years, hosted Rob in her house and has tried to get his diet and exercise on track. Best of luck to Rob!