Hello and welcome to our family!
I agree with everything that Tgal mentioned to you. We cannot tell you if your symptoms are due to Lupus or another auto-immune disorder. However, the symptoms of most of them are very similar (as are the treatments). I have to also reiterate that it is very important that you take care of you. You cannot ignore your symptoms and you must listen to your body (you know your body better than anyone else). It sounds as if your doctor is pretty knowledgeable and I hope that your Rheumatologist is also. However, you are right, knowledge is one of your best weapons and will alleviate so much of the fear of the unknown and the stress that this fear can cause.
If you do get a diagnosis of Lupus (or any other auto-immune disorder), this is not a death sentence. It may mean that you will have to make some lifestyle changes in order to help to manage your illness and you will have to fine a "new normal" for you; one that helps you to avoid flare-ups and/or developing new symptoms. It would also be a good idea for you to educate your family so that they will understand what you are dealing with.
We are here to help you in any way that we can and to provide you with information, advice, and support. I wish you the very best!
Peace and Blessings
Look For The Good and Praise It!