HI and welcome. I don't have a lot to add to the great info that Lynnwood gave you. As overwhelming as it can be, it can be kind of a relief to get a diagnosis. So many of us were made to feel like it was all in our heads.
Just be patient with the plaquenil - it can take several months to really work and taking it with food will help some with any stomach problems. My stomach problems went away after about
dx: UCTD (lupus), sjogrens, reynauds,
meds: prednisone, plaquenil, methotrexate, tramadol, neurontin,
doxepin, folic acid