my 88 year old otherwise healthy mother in law (lives in Canada most of the time) , staying in the Phoenix area for 6 months per year has complained of fever, chills, aching joints and extreme fatigue for the last 24 hours. No cough, no GI symtpoms. She just wants to sleep all day. Her daughter, who she is staying with was recently worked up for valley fever (no conclusive diagnosis). Could this be an influenza or should I be concerned about valley fever?