How can I ease my cough?

[Lilliput]

I have had a cold for about a week, gallons of snot from my sinuses and a really, really bad cough. It's so bad that I have been sick a couple of times through coughing.
I am seriously fed up and have AF just to add insult to injury.
Dh and I are going away for the night without the kids on Sunday for a bit of a gastronimic experience and at the moment I cannot taste anything.
I am taking sudafed for my sinuses but I find cough mixture never really works so suggestions please.

i had a cough like this before and bought a bottole of honey and lemon linctus, was 99p in morrisons. It wasnt a specific cough (chesty or tickly) just a horrible cough that wouldnt go away, i always made sure that i took some when i was getting ready for bed.