What happened is you put extreme blowout pressure on your earmdrums and on the rest of your sinus tubes. Those lead mainly to the brain, so that explain why you got a headache.

You could have blown your eardrums doing that. That's like holding your nose and mouth close while you sneeze. All that air and pressure that should be going out, stays inward and puts pressure on your sinuses and eardrums.

Be more careful next time. You'd hate to blow an eardrum smoking herb.

Glad to see you're still functioning though.