If someone has been seriously depressed all their lives and now has fibromyalgia, how do you get them to excerise and eat right when all they will do is sleep and eat? With fibromyalgia it is supposed to be important to exercise, but with depression they do not have the energy or the ability to do it.
The ideal way to address this problem is for the person to obtain professional help and treat the depression. Along with that the person can start graded exercise, i.e. start low and go slow. Over time the person will have increased energy as the depression is treated and s/he develops greater exercise tolerance.