Congestion on one side of the head.

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What could cause you to become congested on only one side of your head? I'd say 95% of the time that I feel congested or have sinus headaches, it's only on the left side of my head. When I researched this, the only explanation that I could find for this was a deviated septum. I have gotten a sinus CT scan and seen a couple of ENT specialists. They've both told me that I have a slight deviated septum, but that it was so slight that it might as well not even be there at all. One of the doctors said that my nose couldn't get much straighter than it already is. So it seems unlikely that having a deviated septum is causing the congestion to only be on one side of my head. Does anyone have any ideas for why this might be happening? Maybe I just have freakish sinuses, lol.