There are several possibilities. Allergies may cause these symptoms and are usually accompanied by rashes, swelling of the eyes or lips or face.
Other possibilities also include acid reflux which can cause a sensation of breathlessness, accompanied by burping and heartburn.
More importantly would be to exclude bronchial asthma which may be exacerbated by drinking alcohol as this may result in bronchospasm with accompanying dyspnea, cough and wheeze. You would see a pulmonologist to exclude this issue.