Hi! Welcome to the club! I have been diagnosed with SLE, Raynaud's, Fibromyalgia and Sjogren's. It is hard to distinguish which symptoms belong to which condition, so I have stopped trying. My doctor told me they are like "companion" conditions, which are causing similar symptoms for different reasons. It doesn't necessarily mean you don't have Lupus, it could mean you have them both. As Marycain pointed out, Lupus has blood tests that can diagnose it, and Fibro is found during physical examination by your doctor.
The best advice I can give you at this point is listen to your body, when you feel tired or fatigued, rest or sleep if you can. Take care of yourself, stay out of the sun, and my advice is to always research all prescriptions that are recommended by your doctor.
Good luck. Talk to you soon.
"If you think you can, you can. If you think you can't, you're right". - Mary Kay Ash