Sure sounds like. Bad allergies. You should probably see a doc since this sounds like much more than a simple runny nose.
Do I have to necessarily need all symptoms of sinus? Such as runny nose, cough, sneezing etc. Because I just have head congestion is this possible?
Congested head. If after ten days your head is still stuffed you might have a sinus problem.
I have recently had a subconjunctival Hemorrhage & I have also got sinus/head congestion along with a runny nose, could the latter cause the former?
Sub conj bleeding. Can be caused by excessive strain like spasmodic coughing or Sneezing in this case from Chronic sinusitis.