I haven't passed out myself (felt like things were starting to go dark many times but never did pass out). But I've been around this site for awhile -- I'll be 4 years post-removal tomorrow in fact -- and I remember someone posting that they passed out while driving. I can't remember who though. Also several ladies have had seizures with Mirena that 'mysteriously' went away after removal. Please post back if they ever come up with a diagnosis for your cousin, and let us know how she improves after removal. Ditching Mirena is the best thing she could do for her health.