The reality TV star and singer, 27, posted a heartfelt message on Twitter on Christmas Day.
From his convalescence in London's The Priory, he tweeted: "Merry Xmas everyone & thanks for all the lovely tweets.
"Not quite what I planned but one certainly i will never forget! #BeBackSoon Love Arg."
He also thanked Mark Wright, Michelle Keegan and Lydia Bright for their messages, presents and cards.
His fans sent more messages of support, with one saying: "You'll have the world at your feet with a clear mind ;) = GO FOR IT!! Much Love xx."
Another wrote: "Merry Christmas Arg. Well done for what you're doing. Looking forward to you getting back to your old self x."
TOWIE pals also sent festive messages to their troubled co-star.
Jessica Wright said: "Love you merry Christmas can't wait to see you xxxxxxxxxxx."
And Georgia Bright, the sister of Arg's on-off girlfriend Lydia, wrote: "Merry Christmas darling x."
Merry Xmas everyone & thanks for all the lovely tweets. Not quite what I planned but one certainly i will never forget! #BeBackSoon Love Arg— James Argent (@RealJamesArgent) December 25, 2014
Arg entered The Priory to curb his partying ways after getting suspended from ITVBe series, The Only Way Is Essex.
He did not appear in the final episodes of the last series, nor did he feature in the Christmas special.
In October, it was confirmed that he'd been asked to take some time out from the show after reportedly testing positive for cocaine.
Earlier this month, a source told The Sun newspaper: "James was devastated by his suspension from the show and is truly sorry for letting down the cast and production team on the last series.
"He's made the brave decision to spend his birthday and the festive period in rehab."
Merry Christmas Arg, we hope you're back to your best soon!
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Relive some of TOWIE's rudest moments:
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