I am glad you are finally out of that flare! I know many of our members have talked about sore, aching muscles due to their Lupus. I'm not sure if the pain specifically only occurs during or after a flare, but I know it's a common issue amongst the community here.
I wanted to share some information on how to manage that muscle pain, even though you may already know a lot of these tips -- https://lupus.net/living/joint-muscle-pain