Your plaquenil is probably working just fine. Colds/flu in general aren't more/less because of lupus -- except in folks who have serious complications from lupus.
Don't worry, let your Dr know the circumstances, and get well soon!
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & LUPUS RESOURCES
"Life is far too important to be taken seriously." - Oscar Wilde