Well, the cough suppressant with hydrocodone was kind of a bust; at most it lets me sleep for a 2-hour stretch (which is better than 20 minutes, but still). It's really supposed to work for a dry cough, which this is not. The only thing to help consistently has been the antihistamine-decongestant thing. I wake up with clumps of sleep stuck in the corners of my eyes, but I can live with that. This morning I hit a record: slept from 3:15 to 8:45! I pray this will be over by the time I head for the UK; I'm a little nervous about some border person thinking I have swine flu and not letting me on the plane.
For what it's worth, if this is allergies, you will find the plane ride to be bliss: filtered air! I was a white-knuckle flyer in college, but my greatest joy in the spring was flying home to Anchorage from a highly pollenated Pacific Northwest. Three hours in the plane and I felt so much better. Eight or more might even be better. And, presumably, if you don't get better in the UK, you either have the same allergy there, or it's something else. Good luck--I know how bad this can be. And don't overload on decongestants--they are not like antihistamines: they can really wire up some folks. When in college I didn't know better, took a bunch for my allergies, and studied for about 36 hours straight. It wasn't fun--be careful!