It sounds like you have a common viral infection, which is very typical and usually resolves with rest. For your headache and body weakness, paracetamol or ibuprofen can provide effective relief. For the cold and cough, an antihistamine like cetirizine and a cough suppressant containing dextromethorphan can help. If the nausea is bothersome, an antiemetic like domperidone can ease your stomach. Please prioritize rest, stay well-hydrated with fluids, and eat light, bland meals. If your symptoms worsen, or if you develop a high fever or difficulty breathing, please consult a doctor for a physical evaluation.