I'm sorry to hear you're experiencing fever, headache, and body pain since last night. These symptoms could be due to a viral infection or other common causes like flu.

You might consider using an over-the-counter medication like Metacin Tablet, which helps reduce fever and relieve mild to moderate pain including headaches and body aches. However, it’s important to follow the dosage instructions and be aware of possible side effects such as nausea or stomach discomfort. Avoid alcohol while taking this medication and consult a doctor if symptoms worsen or persist beyond a couple of days.

If you develop any of the following, seek immediate medical attention:

• Difficulty breathing or chest pain
• Persistent high fever not responding to medication
• Severe headache or confusion

Please consult a general physician or an infectious disease specialist to get a proper evaluation and tailored treatment. If you want, I can explain how to monitor your symptoms or when to seek urgent care.To narrow down potential causes, we will need some more information.Please tell me your age and gender.