You are lucky guys!!!Dr is in the house!!!
yes holding your nose while trying to blow and hence an increase in pressure may help it...
Just a small tip try taking some steam,( Add some menthol cryatals, available from the chemist, before taking steam). it will help to soften the mucus and makes it more likely to resolve the problem with increase pressure blowing nose method...
It is a very common problem especially associated with the blocked sinus problems...
best of luck!!!