If you get headaches with da buddha when your sinus's are irritated thats the problem I am having.I work outdoors mowing lawns so I get plenty of dust, pollen, grass, etc in my sinuses. Whenever I come home and get to vape/smoke my sinuses are irritated therefore causing headaches perhaps.that's good clear means probably not an infection,
my da buddha will give me these headaches if i have sinus irriation, so it's not always the restrictive ones that cause pain.
have you tried sending vapor through water to cool it down?