Mike "The Situation" Sorrentino is in a tough situation.
The Jersey Shore star, 30, who entered rehab for substance abuse in March, "isn't sober anymore," a source tells Us Weekly in the new issue, on stands Friday.
PHOTOS: Wildest Jersey Shore moments
Indeed, at West Hollywood's London hotel September 26, a witness saw him "downing so many cocktails, he could barely stand." (His rep responds, "He has not been drinking.")
In his first interview after completing an in-patient treatment program, Sorrentino told MTV News, "Ever since I've been out, I'm not gonna lie . . . it's not easy."
The insider adds to Us that the Sitch is stressed the MTV series is ending: "Mike's freaking out about what he's going to do after the show."
The final season of Jersey Shore premieres with a double episode on Thursday, Oct. 4 at 10 p.m. EST on MTV.
For access to all our exclusive celebrity videos and interviews – Subscribe on YouTube!