i dont know if anyone realises they dont have to put up with sinus/sudden pain when diving deep too early, there is a self treatment that can be done too release the air through the sinus channel past the blockage too aid in pain relief as i also get intense stabbing pain across the sinuses,the method can be deadly in the right hands, but just gentle pressure across the two vertical points of the eye sockets above and below the centre of the iris, if you feel for the two small identations one above and one below the eye,they are so very slightly offset. Lay on the the floor and apply pressure to those points with the the heel of your OWN hand,not someone else please,try gently then slowly increase the pressure until it becomes a little uncomfortable, you should be able to hear a small crack that is only audible to yourself,you will feel the pressure in the cavity ease,i must stress this can be very dangerous to your health so take it easy, i take no responsibility in anyway whatsoever for any damage done to any individual. If you require more information PM me and i will digress, happy times waterbodies:martial:martial:crutch