Hello dear, First of all, please do not get concerned with Ross River Virus disease, it presents with a whole lot of different symptomatology. The symptoms as mentioned in your post can be attributed to pathology in the Vestibular Apparatus in inner ear (it is associated with maintenance of body posture & balance) most probably Labyrinthitis or Benign Paroxysmal Positional Vertigo. Symptomatic relief can be obtained with intake of Vestibular sedatives like Betahistine or Cinnarizine preparations (to be taken only under the guidance of a Physician). So, kindly consult your Physician/ ENT Specialist & get a complete clinical examination done. Investigations like complete blood count, estimation of serum electrolytes & vestibular function tests will be required to rule out any pathological cause for the symptoms. There is no need to worry, you will be fine. Till then, maintain adequate hydration & proper nutrition status and avoid stress. And also take precautions like getting up from bed slowly & avoid sudden head movements. Wishing you a Good Health. Take care.