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Recurrent episodes of a cough especially at night, chest tightness and difficulty in breathing are symptoms of asthma. Asthma is a chronic disease affecting the airways. It is due to the allergic reactions to environmental allergens. Most commonly it is due to the dust and pollen allergy. Usually, all the investigations like chest x-ray and blood tests may be normal in asthma. The gold standard test to confirm the diagnosis isspirometry test. It is also called as pulmonary function test.
In your case, you are suffering from all the above mentioned classical symptoms of asthma, and I advise you to do spirometry test to confirm the possibility of asthma. After a definitive diagnosis is made, take the help of a local pulmonologist for starting expert treatment for asthma. The best way to treat asthma is to avoid dust and use a mask. For relieving symptoms of breathlessness and cough, I suggest you Ventolin Inhaler (Albuterol) two puffs thrice daily. To note, asthma is a chronic disease, and there is no permanent cure for asthma. Medicines will work only for controlling the symptoms and improving the quality of life.