A cold for a couple of days is usually caused by a viral infection and often improves on its own within a few days. Feeling weak, tired, and having heavy eyes is common because your body is fighting the infection. You may take paracetamol to help with body aches, headache, and fever if present. An over-the-counter antihistamine, such as cetirizine or loratadine, may help reduce a runny or blocked nose and make you feel more comfortable. Steam inhalation, 2 to 3 times a day, can clear nasal blockage and improve breathing. Drinking plenty of warm fluids such as water, soup, and herbal drinks will help you recover faster and reduce tiredness. Rest is very important, so try to sleep well and avoid heavy physical work for a few days. Eat light, healthy meals such as fruits and vegetables to support your immune system. Avoid cold drinks and exposure to dust or smoke. If your symptoms worsen, persist for more than a week, or if you develop a high fever or breathing difficulty, please consult a doctor for further evaluation.