Hi. I am not diagnosed but my doctor said she thinks I probably have it! I take D-Ribose but initially I read the book 'From fatigued to Fantastic' by Jacob Teitelbaum. This book has helped me enormously. I purchased the supplements he recommends from Amazon.
I have my own dance School and was at the point where I was going to sell up as just having a shower exhausted me. Now I am teaching 6 days a week again. I still get tired and my muscles ache a lot, especially when I first wake up, but my quality of life is certainly hugely improved. I am 64.
Hope that helps.