Numbness in fingers. Please help

Hello. My great uncle is 86 yrs old. His health is pretty good. He still works and drives a vehicle. He has had a problem with his fingers being numb now for a couple years. A doctor has been treating him with some type of laser treatment to stimulate the nerves for over a year. I'm not sure what else he's done, but I gave him some Apple cider vinegar last time I saw him and he finished the bottle. I would really like to put him on a cleanse but thats not an easy feat, and I don't live close enough to help him with it. Its hard for him to not have use of his finger tips- especially being an electrician. He told me the doctor said it was carpal tunnel. Does anyone know of how to treat this???? Tweet