I Currently Use A CPAP With An Attached Humidifier. However,

I currently use a CPAP with an attached humidifier. However, I continually experience nose bleeds from my left nostril. When this happens I have to suspend use of the CPAP until the nose heals. At the advise of an ENT I have been slathering the inside of my nose with Vaseline, but this still does not stop the bleeding. The right nostril has been cauterized no less than 10 times. When I do not use the CPAP the quality of my sleep suffers. Can you give me some advise?