Rumors started circulating yesterday that KIT HARINGTON had checked into rehab.  Kit played Jon Snow on “Game of Thrones” . . . and the “New York Post” said he was seeking help for “stress and alcohol use.”

Kit’s rep confirmed that he’s entered a “wellness retreat,” but downplayed the seriousness of it.  Quote, “Kit has decided to utilize this break in his schedule as an opportunity to spend some time [working] on some personal issues.”

The rep insisted he was NOT there for “rehab,” and emphasized the words, “wellness retreat.”  But didn’t elaborate on what the “personal issues” are.

Kit is supposedly at a “luxury” facility in Connecticut, which costs more than $120,000 per month . . . and the “Post” says he’s been there for about a month, and it’s unclear when he’ll leave.

For what it’s worth, Kit has said the ending of “Game of Thrones” hit him hard.  Quote, “The final day of shooting, I felt fine . . . I felt fine . . . then I went to do my last shots and started hyperventilating a bit.  Then they called, ‘Wrap!’  And I just [effing] broke down.”