If you like ginger, try adding this to your concoction in some form (grated root ginger is best). It's very good for hoarseness and tickly throats.Even a herbal tea-bag with ginger in the mix can be very soothing - that's my quick fix if I'm coughing at night time.

But I've had this happen after a cold sometimes too. Some colds don't affect my voice at all, while others can leave me unable to sing more than a few lines before starting to cough or wheeze, even though I'm otherwsie quite well. You may just have to be patient and take things easy for a little longer.

Marje