Shortness of breath with forced nasal breathing is often due to nasal blockage, anxiety, or airway irritation, reducing normal airflow. Do steam inhalation, practice slow deep breathing, keep your nose clear, stay hydrated, and avoid dust or cold air to ease breathing. Try to stay calm, sit upright, and notice if symptoms worsen with stress or activity. If this keeps happening, worsens, or is accompanied by chest tightness, dizziness, or breathing difficulty, consult a doctor for proper evaluation and care.