I don't have fibro, but I worked in a clinic where we had a specialist in PT for fibro. I helped with a lot of fibro patients, but I'm no expert.
Fibro can go into "remission" and it can get worse. Got a mind of it's own! Like many autoimmune diseases it seems to be aggravated by stress and helped by exercise.
Did you do PT for a home exercise program specifically for the fibro? The therapist can look at what parts of your body and aspects of your strength are most effected and give you exercises and stretches for those areas. The home program is in addition to your usual activity. The therapist can also help you figure out how to pace yourself and how to gauge recovery times.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson