Gossip guruWendy Williams has been privately struggling with “alcohol-related” brain damage that is believed to be the root of her cognitive decline, RadarOnline.com has learned. Sources close to the former daytime talk show icon claimed she got the diagnosis in 2019 while at rehab in Florida, according to a report ahead of her upcoming Lifetime documentary. They said a brain scan was done as part of her stay. A neurologist then sat down with Williams, her son, Kevin Hunter Jr., and her then-husband, Kevin Hunter Sr., to share their findings, according to a report from The U.S. Sun. “They told…