I guess it would depend on how old the son is. Is he an adult or child ?
By moving to a warmer climate, i'm assuming you feel it will help your symptoms. Sometimes people with fibro are sensitive to heat so I pray that should you do this, you are making the best decision for yourself.
If he is a child it would make it more difficult to leave. If your son is an adult and your physician feels the warmer weather would improve your health...were it me i'd have to say yes I would move.
Best of luck on a tough decision.
What I found out was that i needed to be in a mild climate not a really hot climate or really cold climate. Heat brings on fatigue and symptoms just as much as cold dose. Well acctually it really is the changes in the weather that bring on most of our symptoms. I also interviewd many fibro people from warmer areas and there symptoms were no better than mine. Accutally there symptoms were worse because they had to deal with extreme hot weather alll the time and then drive or work inside of live inside with the air conditioning on. The grass is not always better someplace else. Also one friend of mine said it best when he said preperation is what you need to do for both cold and hot weather and weather changes.