I'm a real noob so it doesn't take much to get me stumped.

I've suddenly lost 80% of the devices on a circuit. No power in the outlets, the light switch doesn't work, yet the bathroom devices all work, all on the same circuit. With my limited understanding, I always thought it was all or none on any given circuit. I popped the fuse and it was OK (SO complained she was trying to wash her face

) If it means anything, I know there's a faulty GFCI in the bathroom but I don't see how that could affect the rest of a circuit. Any ideas? TIA for all your help.