Woofgang, are you sure it was FIBROmyalgia and not POLYmyalgia that your friend had? They are completely different. Polymyalgia is an inflammatory condition, and is certainly treated with steroids, sometimes quite high doses. Blood tests show a high level of inflammation going on.
In comparison, Fibromyalgia is a chronic pain syndrome of unknown cause, characterised by fatigue, sleep disturbance and multiple painful trigger points. It can be secondary to rheumatoid arthritis, but more usually associated with osteoarthritis or chronic back pain, or may occur with no identifiable cause. There is a school of thought that it may be a primary sleep disorder - certainly research shows that in otherwise healthy people, interrupted sleep can give rise to fibromyalgia-like symptoms. Blood tests usually show no inflammation. It is diagnosed by excluding anything inflammatory, and having at least 11 out of 18 recognised tender points.Occasionally steroid injections may be used to settle down trigger points, but they have no lasting effect.
Bad news is that there is no cure for fibromyalgia, and very few effective treatments. Good news is that the symptoms are variable, and for every bad day there will always be a better one. You're right, noddy, management is the key to it (which doesn't mean grin and bear it, it means tailoring your activity to your symptoms and planning ahead.) Try and get your doctor to refer you to physio and occupational therapy for advice on learning to make the most of your energy and keep pain to a minimum. If there's a multidisciplinary pain management programme in your area that may also be useful.