Last Saturday night water came into my nose accidentally all the way to forehead, after being poured in for about 2 seconds, and since Tuesday I felt pressure in my head in particular under left eye and I think the pressure moved a little bit upwards or it expanded. I had a nose swab a week ago, nothing found. Is this sinusitis because of chlorine in water? I tried inhaling some oregano oil several times and I am not sure if it had any effect. My nose has cleared up today it was stuffed and more slimy previous days. Also, i feel sleepy, sleepier than usual. Should I buy some sea salt and inhale, or what? Is there a spray that removes this pressure?