'MythBusters' Host Grant Imahara had Bad Headaches Before Fatal Brain Aneurysm

Grant Imahara complained of migraines in the days before doctors discovered his brain aneurysm, and emergency surgery, sadly, couldn't save him ... TMZ has learned. Sources close to the "MythBusters" host's family tell us ... he'd been experiencing…

'MythBusters' Host Grant Imahara had Bad Headaches Before Fatal Brain Aneurysm
Grant Imahara complained of migraines in the days before doctors discovered his brain aneurysm, and emergency surgery, sadly, couldn't save him ... TMZ has learned. Sources close to the "MythBusters" host's family tell us ... he'd been experiencing…