anyone know any episodes where the main character faints?

Niles Crane on Frasier was prone to fainting at the sight of blood. I don't know the specific episodes but there may be some way to look them up.

Ginger & Mary Ann both faint on Gilligan's Island in the episode "Hair Today, Gone Tomorrow."

I think there was an episode of Cheers where Rebecca fainted.

Didn't Diane used to fake fainting a lot on Cheers?