Persistent cold and head heaviness after antibiotics may be due to viral infection, sinusitis, or resistant bacteria. Use steam inhalation, saline nasal spray, and antihistamines for relief. If symptoms continue beyond 3-5 more days or worsen, consult a doctor for further evaluation.

For throat pain, try paracetamol for pain relief and warm salt-water gargles several times a day. You can also use lozenges or throat sprays to soothe irritation. If pain is severe, persistent, or accompanied by fever, consult a doctor.