Hi Dear, Understanding your concern. As per your query you had metallic taste in mouth along with fatigue which is due to poor oral hygiene of oral cavity ( it could be gingivitis, periodontists) or use of medications such as antibiotics if any you used for sore throat or cough. These symptoms are something you need not to worry about. You can easily get rid of that by visiting dental surgeon once and cleanliness of oral cavity done. Take supplements rich in iron. Get a complete hemogram and blood indices done and visit general practitioner if symptoms are not dental related. Fatigue, tiredness is due to due to fluid & electrolytes imbalance in the body. Take oral re hydration solution for that. Take fruit, juices, lime . Dopmperidone or Enteric coated tablets will be helpful. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari