Thanks for your query.
Relax,there is nothing to worry.
Children become little fussy after vaccination
,there are only few minor symptoms which settles in couple of days.
OPV and hepB is not known to cause much problem,only few loose stools sometimes after OPV.
Continue with breast feeding,monitor his activity,feeding pattern,urine output and in case you find any change consult your pediatrician
Wishing your baby good health.