My brother in law just called me to ask what could cause him to wake up at night, with massive bleeding from the back right upper area of his mouth, to the point, he feels like he is drowning in blood, and has ruined 4 pillows and 3 sets of sheets. Also he said a couple nights, he has had a horrible headache. It is not coming from a tooth, and he can see the location and he said it is pumping blood, not just a drop now and then, and this has happened for the past 4 days.