Yes, stress can cause all kinds of symptoms to flare up. It's important to minimize stress as much as possible, all the time! Eating healthy, regular mild exercise, and deep restorative sleep are as important for us as medication is!
You can ask your rheumatologist and your dermatologist about
the rashes and the appropriate treatment. There are so many different kinds of rashes that we can get that I wouldn't know what to recommend. I do know that you need to avoid anything with alcohol in it - that can just aggravate things further.
As for exhaustion - you say you are beyond tired all the time. Have you ever had a sleep study? Do you get deep restorative sleep? I was sleeping 18+ hours a day and still feeling exhausted when my rheumy prescribed Trazodone as a sleeping aid. I thought he was nuts, as I was already sleeping all the time! But with it, I sleep 10 hours and feel pretty good most of the time. (Unless I get stressed, of course.)
Hope that helps!
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2000DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde