Hello and thanks
You need to get your X-ray chest and some investigations done to know about the cause of the cough
. If already done please let me know the reports. Now to get relief and sleep follow certain steps:
1. Keep the head side raised at about 30-45 degree.
2. Take regular steam Inhalation and try to expel out the phlegm as much possible.
3. If there is shortness of breath
you can take inhalers to get immediate relief.
4. Chest Physiotherapy
will also help you out.
5. Keep yourself warm and protect from cold
Hope this will help you. But you must consult your doctor as soon as possible.