Hi Denise, so sorry you feel so bad. Hippi is right about
the rash under the breasts - this could be yeast. You need a certain cream for this - it really helps - but I cannot think of the name of it (lupus fog tonight) - does anyone remember?
Also, if you are having sinus problems you might need an antibiotic which will cause more yeast issues. So, if you aren't already taking acidopholis for the yeast you might want to go to the health food store or almost any pharmacy for this. I get the small pills, called "Pearls" from Meijer and they do not need to be refrigerated. I carry them in my purse and it really helps. The Pearls might help with the rash, too, not sure...
But, anyway, a sinus infection can cause fatigue, too, so be careful. All of what you describe can certainly cause or be the cause of a flare. Stay hydrated and rest a lot! My prayers are with you.
Lupus, RA, and (Maybe) Fibromyalgia and LOTS of Medications!