Welcome to ask the doctor.
Thanks for the query.
You seem to be suffering from asthma or acute bronchitis which is known to cause chest tightness, difficulty breathing and shortness of breath on exertion, or even while talking and laughing. You may also have an obstructive airway disease apart from asthma. You will have to see a pulmonologist to examine you and auscultate your chest. A pulmonary function test may be needed to check your lung function and you would be advised accordingly. A course of bronchodilators like salbutamol or steroid inhalers and antihistamines in case of allergic bronchitis may help. Stop smoking and alcohol if you do so.
Hope this helped.
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