There are many causes of chest tightness. For example, it could be a problem with the lung like asthma or it could be a problem with the heart with water getting into the lungs. Sometimes it can even be due to material from the food pipe coming up and bits getting into the lung (GORD). Given your other symptoms it could be that you are an allergy prone person and therefore asthma might be a real possibility. You need to discuss these options with your doctor.
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