Welcome in H.C.M.
I read your query regarding your ear problem developed on blowing your nose as you have recently recovered from flu
. During blowing of nose infected secretions from throat reached to ear via Eustachian tube. Thus middle ear gets filled with infected fluid which is giving you feeling of blockade in ear. thus you feel sudden loss of hearing.
As far as treatment is concern you should take- steam inhalation, Decongestant, anti histaminic and antibiotics.