Can physical therapy help relieve fibromyalgia pain?

Multiple ways. Pt can apply "modalities" of heat cold ultrasound electrical stimulation. They can do trigger point massage deep muscle massage as well as loosten you up with stretching and start you on a general aerobic exercise program.
Yes. So far the most effective exercise program for fibromyalgia has been the institution of a gradual aerobic exercise program. This seems to increase serotonin levels, one of our "feel good" chemicals, help clear the foggy feeling in the head that some people get and improve depressive symptoms that are also quite common.