When I was growing up i suffered from a terrible cough about once a year. Its a little less frequent now but heres what I was given. The Dr prescribed me antibiotics and then gave me cough medicine with codine in it, when i was a little kid, mind you. Always a good thing to give a child narcotic cough medicine. At any rate, this was about the only thing that would allow me to sleep. My mother would also make warm orange juice, and honey to give me after i drank the medicine cause it tasted terrible...whether that helped at all or not, i have no idea. As i have grown older, i still get the same thing, just al ittle less often. the last round with it i had in the middle of summer time and it was the worst it had ever been. Here is what i used - Dr initially prescribed me with Zithromax or three days to get rid of the infection( i had a sinus infection to go along with the cough it was grrreat). this did a small amount to get rid of the sinus pressure but that was about it so i went back and got another three days worth (mind you this medicine stays in your system for about ten days for every three days worth of pills....i was sick for about a month, maybe a little more) along with a precription for Prednisone, a steriod that allowed my airways to open up so i could breathe again...that was probably the largest help to me. I combined this with some benedryl to help me sleep, along with some OTC codine cough medicine and Mucinex, Zicam, Theraflu and Airborne (all otc medicines). I slept alot and started to feel alot better after about two days...three days and i was almost back to normal...it was still about a week before the whole thing was gone but at that point, you name it, i tried it to get rid of my cold.
I also have a friend who has had great success using something called Buckleys...apparently its the WorST tasting thing ever and i havent tried it yet as i havent needed to, but she swears in a day, both her and her husband were feeling incredibly better.
I hope some of that might help! I also use a vaporizer near my bed at night to loosen up the chest...preferably with vicks vaporizer stuff in it....