thanks for asking before making diagnosis it is necessary to physical examination past history of other diseases always but as your query side effect of cetirizine:- fast, pounding, or uneven heartbeat; weakness, tremors (uncontrolled shaking), or sleep problems (insomnia); severe restless feeling, hyperactivity; confusion; problems with vision; or urinating less than usual or not at all. Less serious side effects may include: dizziness, drowsiness; tired feeling; dry mouth; sore throat, cough; nausea, constipation; or headache. BUT as per your history and without physical examnation and past history since your childhood , you may be suffering from Bronchialm Asthma you need to consult Chest Physician and also need Chest Xray Pulmonary fucntion test ABG CBC AEC absolute eosinophils count then it conclude to final diagnosis