My sympathies, I got mine at the office and it just kept going around and around (large office). Fortunately, I finished the temp job and have been at home. You just kind of have to rest and wait it out, BUT that said, I found a really nasty cough mixture that was the only one of its kind that gave me some relief. It's called Covonia mentholated cough mixture and expectorant, in a brown glass bottle and I bought it at Sainburys.
I've had the tears running down my face from coughing so hard as well, it's nasty.