Red, itchy patches with burning for a long time may be due to conditions such as Allergic Dermatitis or Urticaria. Medicines like Cetirizine can help control itching, but if the symptoms keep returning, you may need proper evaluation by a dermatologist. Treatment may include anti-allergic medicines, medicated creams, and identifying triggers such as certain foods, dust, chemicals, or hair products. Keeping the skin moisturized, avoiding harsh soaps, and reducing scratching can also help. Since you are also experiencing scalp itching and hair loss, it is important to consult a doctor for a detailed examination and appropriate long-term treatment.

If your breathing becomes difficult at night during a cold, it may be due to nasal blockage or airway irritation. Try steam inhalation before bed, sleep with your head slightly elevated, and use saline nasal drops to keep your nose clear. Drinking warm fluids like soups or herbal tea can also help. You can take an antihistamine like Cetirizine at night for relief. However, if you notice wheezing, severe breathlessness, or symptoms not improving, it is important to consult a doctor.

Cold and nasal blockage after AC travel is usually due to dry air and irritation. You can take steam inhalation 2-3 times a day, drink warm fluids, and use saline nasal drops to clear the nose. An antihistamine like Cetirizine at night can help reduce sneezing and blockage. Keep yourself warm and avoid further exposure to cold air.