Has anyone ever tried nasal irrigation?

I have, it works wonders!

what is nasal irrigation? Is it the trick where you suck up 10-20ml of water up your nose? Because if it is, then I am not trying it...

But what does it do? does it unblock your nostrils? Does it moistens your nostrils?

Nope, they go into your nose and drain the fluids. Sometimes they leave a tube in so it drains over a day or so. Often they use a fluid (saline-like) to rinse it out.

It doesn't really hurt, but it is 'invasive', sort of.

The last time I had something like that done to my nose I ended up sneezing for like 2 hours. It was horrible, I felt like ripping my nose out. it was really desesperating =b

It does help though, and not only for people with sinusitis. If you manage to sort of sniff a little bit of luke warm salty water, through osmosis it will strengthen your nasal passages, clear out the mucus and improve the air flow altogether. You will end up breathing much better than you have ever done, and have no more nasal congestion at all.

I remember, when I had my nose operation a few months ago (after I had broken my nose, they had to correct my septum), I was given a spray called Sterimar, which is nothing but sea water. But, my goodness, does it make a difference. Also, instead of spending a lot of money on nose drops when you have a cold, just use salty water instead, you will see how it will clean and unblock the nasal passage. (Many commercial nose drops are just that anyway: water with salt added to it).