I have had a horrible head cold for three days.  My left nostril has
been leaking all day today - only my left nostril.  I am also only
getting discharge from the left side when I blow my nose.

Today, I used my grossan tip with my waterpik to rinse my sinuses with
saline solution.  As usual, with the tip in my left nostril, the water
drained primarily and readily from my right nostril.  But, when I put
the tip in my right nostril, it did not drain at all at first, then, it
began to drain from my mouth and then my right tear duct - seriously
- the water was pouring out of my eye.  Nothing was draining from the
left nostril.  During this, I felt enough pressure that I decided to
stop doing that.

Why on earth, if the water can get from my left nostril to my right to
drain can it not get from my right nostril to the left to drain.  It
doesn't make logical sense to me.  If it's plugged, then water
should be impeded from flowing either direction, right?  This has never
happened before.  Is this a problem I should worry about?

Anyone understand sinus cavities well enough to explain this?