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is a serological test to detect indirectly Typhoid as far as your report is there S.Typhi O Titre is 1:160 which is significant. Although repeat test after few days and a rising titre is more significant and diagnostic.
But it is to be corelated clinicaly as intermittent fever
is not consistent with typhoid,so other possibilities like Malaria
as you have severe Cough, should also be considered.
Widal test is usually positive after 6-7 days of fever initially if Typhoid is suspected a Blood culture
may be ordered.
If it is Typhoid approximately 10days therapy with suitable antibiotic and recovery period may be 2 weeks.
Kindly consult a Physician
Good Luck to You