Hair loss during or after recovery from acute illness is a common finding. It is a self limited condition and no treatment is needed.
Daily loss of few hairs is common during combing or spontaneous, as it is a sign of normal growth
(different phases of hair growth). But acute increase in loss may be seen following illness as in your case( known as Telogen effluvium
Few drugs can also cause this,. In that condition discontinuation of drug is needed.
Thinning of hair is a genetic condition which usually progresses with age.
This hair fall
can continue for week or month.
I would suggest you to consult a dermatologist
rule out the other causes of hair fall if any and treatment accordingly.