You might be talking about Detective Doug: The Ring at Midnight. This is a suspense crime online movie directed by Lu Lei and starred by He Gang, Gao Xuanming, and others. The film told the story of Detective Doug, who found a string of mysterious numbers when he was solving a murder case. After reasoning and investigation, Doug found that the string of numbers was related to an ancient curse. Anyone who received this call would receive a mysterious phone call at midnight and then die mysteriously.
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Sherwood is purely fictional. It takes creative liberties to weave an engaging tale, rather than being rooted in reality. So, don't expect it to be a true account of events.
I'm not sure exactly who Doug is without more context from the '600 pound life' story. But he's probably someone who has a very large amount of weight to deal with, like 600 pounds, and the story is likely about his life experiences related to that weight.
The real story of Sherwood is likely to be about the Sherwood Forest in England. It is famous for being the legendary haunt of Robin Hood and his band of Merry Men. They were said to live in the forest, robbing from the rich and giving to the poor.
I don't think it's a true story. 'A Haunting in Sherwood' is probably just a creative concoction to thrill and entertain, rather than being based on actual events.