In my opinion, lupus is one of the most difficult diseases to diagnose because it does share so many similarities with other diseases. Saysusie will be by to share alot more information with you. She's a wealth of information when it comes to lupus information.
Because I have CNS lupus in addition to everything else, there are many of the same neurological symptoms that MS describes and so it took a very long time for my diagnosis. My only words of advice to you would be to research, ask lots of questions, and make sure that you have a doctor that you like. This has been one of the most important things I have done for myself. Lupus symptoms vary from mild to life-threatening and there is no cure - so, you'll have a long relationship with your lupus doctor. Having one that you like and trust is paramount to managing life with this disease.
I wish you the best, my prayers are with you. I would like to encourage you to stay plugged in to I HAVE LUPUS, there are lots of great people with a lot of information to share.
Take care & much love,
"I believe that friends are quiet angels who lift us to our feet when our wings have trouble remembering how to fly." - unknown