Welcome to our lovely family at WHL who will help best we can and there's so many threads to venture through concerning the Disease to learn from, as somtimes issues arise where we have'nt got a clue what it maybe but there's always someone ready to help.
Refering the weight gain ask to be checked out regarding your thyroid glands, as i have thyroid trouble and that can make you either lose weight or gain it and this is involved with Lupus...the malar rash (Butterfly rash) i had burning red and so sore mine took a while to move and i also have discoid Lupus and i am pleased your seeing a Dermo specialist as i'm under a great one and he run bloods on me to find out what i had which was also psoriasis and he put me on steriod based creams, they're excellent for removing rashes but you need a 6mths break regular as they're also an aging process but mainly to the face.
The bouts of fatigue comes regular with Lupus and i also suffer the elbow pain, which was diagnosed wrongly for tennis elbow, it's quite painful and palpations can also happen that can come on through anxiety also but i wish you all the best with your appointment tomorrow.
A flare can last from a few days going into weeks plus months it's according to how active the lupus is.
Hugs your way Terry xxxxx