I know someone who has fibromyalgia. She has so many problems and is in such pain that she had to quit her job as a research biochemist. She takes a lot of pain meds, including oxycodone.
I am familiar with CFS -- was diagnosed after my daughter was born. I was so tired that I was almost dysfunctional. Thank goodness I'm a professor and only have to be on my feet a couple of hours a day. My doctor wanted me to quit my job, but we couldn't afford it -- we were building our dream home at the time. BTW the CFS sort of "went away."
So I can't imagine having both ailments at once. I will be praying for you, Kat.