If you have been experiencing symptoms like coughing, sore throat, and nausea for the past two days, it is important to stay hydrated and focus on consuming light, easily digestible foods such as soups, broths, toast, eggs, and brown rice. Avoiding heavy and sugary foods like red meat and undiluted fruit juices can also help in improving your condition. Remember to maintain proper nasal hygiene with saline solutions and drink fluids regularly to stay hydrated. If symptoms persist or worsen, it is recommended to seek medical advice.