There is a possibility it can be. Other things that mimic lupus symptoms are lymes, rocky mountain tick fever, fibromyalgia, MS and low Vit. D.
Here is a web site that might help you sort out the lupus question:
fever, headache, chills, severe muscle pain, fatigue, nausea, vomiting, rash, cough, lymphadenopathy (?), arthralgia (?