Lupus, like diabetes, is insidious. It invades every area of your body and disrupts every part of your life. There is no cure.
How long ago were you diagnosed? There is bound to be a mourning period. Then it's time to look for help to control the symptoms and deal,with the pain, and learn to handle the new limitations you have been handed through no fault of your own.
You also need to learn to forgive yourself for feeling hopeless and helpless. Eventually you'll,need to stop crying and seek relief. You have just been handed a life sentence for a crime you never committed. Of course you're sad. You are probably angry too. But you must get through this and try to find some quality of life.
My heart is with you in this terrible time.