A new HBO documentary, “Game of Thrones: The Last Watch,” shows Harington, 32, going through a range of emotions when he first learned his character Jon Snow kills the woman he loves, played by Emilia Clarke.
The actor broke down in tears saying goodbye to the cast and crew after filming his last scene.
"You’ve been just my family, I love you forever and thank you so much,” he said in the doc.
Harington has reportedly checked into Prive Swiss in Connecticut. He is being treated for stress, exhaustion and alcohol abuse. A one-month stay costs $120,000.
He admitted himself shortly after hosting “Saturday Night Live” earlier this month.
Harington has had some problems in the past. Video shows him getting kicked out of a New York City bar last year for reportedly being drunk.
A rep for the actor said Harington "has decided to utilize a break in his schedule to spend some time at a wellness retreat to work on some personal issues."