How can I fix my bathroom light/fan?

Hello,

I have a combo light/fan switch in my bathroom - so when I turn the light on the fan comes on too.

Unfortunately, this has somehow broken - when I switch it on, neither the light or fan comes on. One light in my bathroom was flickering for a couple of weeks leading up to this.... prehaps I just need to change the one light??!

Obviously, I have no clue how to fix it, so any suggestions would be helpful. While showering in candlelight is quite romantic and relaxing, applying my makeup in the dark so i look like a clown is not...

Thanks,

S