Namaste to all!

I have a problem... I've started doing Jala Neti Kriye again after a long break and now there is a problem. Half an hour (approximately) after Jala Neti Kriye i start to sneeze and i fill like something is tickling me in the nose. My nose is full again and i snuffle a lot too. I sneeze all day quite a lot. What is wrong here? What do you think where is the cause for that?