I am hoping you will get multiple answers for your question as this one is a little tricky for me. As far as Fibromyalgia pain disappearing after the virus leaves a persons system, I would have to say most likely not, unless the pain is actually coming from hormones or the virus itself, so I suppose it's possible.
One theory about Fibromyalgia, is that it can be caused by physical and emotional trauma to the body, which creates an over sensitization of pain by the central nervous system, which is part of your brain's regulatory system. It's unlikely that even if you're fiance is cured from the virus that her body will "forget" the pain and remember how to feel normal again. She will need help.
It is possible for even the worst of us Fibromyalgics to put our pain in remission with proper stress, diet, exercise and medication management. It just takes time and the right environment. Perhaps some cognitive therapy might be helpful? Don't give up. Fibromyalgia can be managed and improved.
I posted this question under two topics the first
1: Hepatitis C
I received a reply from one person stating that she suffered both and after her course of treatment has been cleared of the virus, and 6 months later has been in no pain since!
It just did not make sense to me that her Fibromyalgia was only affecting her hips then once her Hepatitis woke up from the DEAD! the Fibromyalgia become more severe, this tells you hepatitis has a lot to do with it, as the blood is affected, the affected blood affects other parts of the body!
There can be light at the end of the tunnel