Hi Rosie,
Welcome to the group, Lupus is known as the great imitator, so this Rheumy doesn't think you have it, BUT that does not mean he won't continue to look for it. I have SLE on an Overlap Syndrome diagnosis, that means there are several autoimmune diseases that I have several symptoms of, but I do not HAVE the disease. I am constantly 'watched' for them though. It is not a bad idea that this present Dr is cautious enough to make sure you have Lupus before administering drugs for it!
I take Lyrica for Sciatica, this is a very specific nerve pain in my left leg, so it is easy for me to know when the Lyrica is helping it because it is in one place only. It does take time for Lyrica to work and for you to adjust to it, and to take it for widespread pain makes it more difficult to determine if it is helping and how much, because how we feel fluctuates rapidly.
Though I measure it's success by how that upper left leg feels, it does also help nerve pain throughout my entire body.
Fatigue is a tough one, we all battle that. Check with your Dr about good vitamins that may help or possible vitamin/mineral deficencies. My Chiropractor is my vitamin Guru, all of the DCs are brilliant with vitamins and warn against wasting money for grocery store vitamins, mine told me to throw them away, they were worthless, though some of you may have found a good quality one there, take them along, let them decide.
My Rheumy is the one who explained the 'brain fog' to me as "pain, chronic pain and lack of sleep" as the cause.
There is much to be learned here about Fibro, but I can only encourage you to be your own advocate and find all you can about this condition. Knowledge is power, fibro is too complicated to explain in the time a Dr has to examine you. Google and Ben's friends will teach you much if you are willing to spend the time.
Lyrica is for nerve pain, it will help you with that.http://www.emedicinehealth.com/fibromyalgia/article_em.htm This will give you some general information.
Welcome to our family, hope that you get the good care you deserve so that you can begin to feel better. Please know that I am not a Doctor, just a fellow patient.
Hugs,
SK