Hi.
Thanks for your query.
Your history of flu like symptoms,
abdominal pain,
vomiting, nausea, headache which has isolate to the left side and nose bleed is indicative of the following:
Typhoid - one gets the similar problems with nose bleed.
Or Flu with secondary infection of the GI tract and Upper
respiratory tract.
I would advise you the following:
Get the vitals and general examination done by the Doctor.
Investigations of the blood, urine , stool.
CT scan of the Brain and
sinuses to rule out any internal problem causing nose bleed and left sided headache.
The treatment will be symptomatic to start with like an antibiotic, topical and oral decongestants, painkiller for headache.
The specific treatment may be continuation of the same or changed as per the reports.