Hi,Thanks for query,
common cause for bleeding from nose and having headache is having high blood pressure
As he had BP normal but it is possible that after bleeding may show normal bp.
Go for regular bp check up and keep record and after record go for treatment accordingly.
Another cause might be some congestion or soreness in the nose giving him this problem so consult ENT sp.for local examination.
Meanwhile ask him not to touch or squeeze his nose.
Put decongestant nasal drops like Otrivin
Ok and bye.