Welcome in H.C.M.
I have gone through your query regarding your fever associated with headache, body ache
, blocked nose etc . you are also having loss of appetite , nausea
and excessive thirst.
In due course of time other symptoms get improved but remain thirsty . You are in doubt weather this is due to viral fever
or some thing else.
Regarding your excess water requirement and less excretion indicates water stasis which sometimes seen in viral fever but it is reversible. if oligurea persist for long time and give rise to nausea and vomiting
than seek advice of specialist to prevent renal failure