Don't even dream of it! With a cold like that, you will experience great eardrum pain, possibly even splitting your drum, and then you'd be off work for months. You can't get a note now- I think employers nowadays self certify sickness for 7 days? I don't think it is 3 days anymore. Stay home, keep warm, watch daytime TV. Nobody else wants to fly with you when you have a belter like that!