Yes, Samy, I can help.
Just to put things in perspective, it is unusual for sinusitis to follow a cold, despite public opnion and particularly on AB.
You seem to have what is known as Vasomotor rhinitis, a condition of the nasal anatomy called turbinates, which when the swell produce nasal blockage and or nasal discharge, thick or thin. The cause of Vasomotor rhinits is not clear, but is frequently, but not always due to an allergy.
The treatment of this condition is rather haphazard as the cause is not really known but does indeed respond to steroid nasal sprays, operative procedures are disappointing in that they may well have to be repeated frequently.
You clearly have Vasomotor rhinits causing swollen turbinates and I agree with you new E.N.T surgeon as to staring you on nasal steroids.
You are not suffering from sinusitis but vasomotor rhinitis that will come and go for the rest of your life.
Keep away from E.N.T surgeons -;)