Nausea, Vomiting, stiff/achy joints and muscles, upset stomache, fever and chills. No diarrhea. Ache in abnomen comes and goes. Sore neck. Cause pls?

Viral illness/ This sound like a typical viral illness. This GI symptoms and the body aches are reminiscent of this. would go to your local health clinic for further treatment and or diagnosis if simple treatment for this problem does not work .The simple treatment is only acetaminophen or ibuprofen. Best wishes.