Is this barotrauma in the sinus cavity or in the middle ear? All it means is that you have unequal pressure in one or the other when compared with the pressure outside your head. I believe the correct terms are sinus baratrauma or otitic baratrauma.
There are various ways of equalising this pressure from the "pinch the nose and blow gently down it" to medical intervention.
If you are still getting problems you must see your GP and get referred to an Ears and Nose man who will know how to advise you.