What are the odds that Fibromyalgia and CFS will eventually become MS?

Scientifically, virtually zero.
Please read:
http://blog.360.yahoo.com/blog-uvfiavi8f...

they certainly seem to have a lot of common ailments and symptoms.
Please check out The PH Miracle. It's a book. and a life saver!
My sister had CFS for 6 months before the doctor diagnosed her problem as ME. She has now been sufferng with the illness for 6 years and has tried most of the suggestions to get better but nothing seems to be working.

If you have got CFS then i would just say to listen to your body and don't think that you can do more than you can. I think that that was my sisters mistake because she did not want to admit defeat. Don't push yourself further than you can actually go.