May be due to some viral infection.generalized lymphadenitis
is associated with many disease like glandular fever
infectious mononeucleosis.hiv,or some malignancy like barkitt,s lymphomaa.can u tell me what is ur dlc or have u done haemogram it will help to come an conclusion early.is ur esr
raised?I will suggest u to go dlc ,if it is found that there is relative lymphocytosis
thn u are suffering from viral infection.do worry do investigation proper u will get well soon.