Dry cough when i lay down on bed. Mps. )

Its been more than 6 weeks i have been suffering.Initially, a burning sensation in the chest was severe  specially after consuming any spicy food ..but it will normalise on its own, once i followed some home remedies like ginger juice or baking soda with water for neutralizing the acid..i went to a local pharmacist he gave me an antacid for a week,i cured perfectly.I got back to my normal schedule but still managed to have healthy and non spicy food and also controlled smoking as per my doctor's advice. But now when the chest burn was cured i started having dry cough every time i would lay on my bed.No other issues no chest pain no breathing issues  (it happens only if i climb the stairs once or twice) neither any fever nor cold.I feel hungry i consume though less quantity of food.Recently,i went to a MD, he prescribed me some medicines and today the course will be completed but still the dry cough hasn't cured yet.I shall send the prescription along with that i aslo had (PAN Mps.)