Hi,
Have you got any diagnosis......sorry if I've missed something.
I think sodium levels can vary due to many things like hydration or renal function.
I have a high sed rate (always) and a low white count plus anaemia (low red cell count)when flaring. I have 'mild'lupus ( and raynauds) that is fairly classic .......skin rashes, joint pain ,fatigue, headache, fevers and muscle aches plus weight loss. Lupus is considered 'mild' where there is no organ involvement though the term is debateable
Welcome to the site, hope it helps