My dd is the same...cough cough cough!
Like the previous poster I put vicks on the soles of my dd's feet, then put her in a babygro and it really does work!
After having bronchiolitis I bought a humidifier from Argos, it only cost about £20 or so, but it really helped.
I find that brufen is great too
at the end of the day...coughing is a normal process and is vital to clear the airways so just grin and bear it! (I know you probably didn't want to hear that!)