How long have you had the fever post the completion of antibiotics? There isn't sufficient information to suggest a specific diagnosis. I would advise you to visit a MD General Medicine so that you can be examined and undergo the necessary investigations to find the underlying cause and have it treated accordingly. Also you should get a Chest X-Ray PA view done.
Next Steps
in the meantime follow these:
1) Hydration- Please stay hydrated and drink water as often as possible.
2) Avoid junk food, stick to homemade food and fresh fruits.
3) Paracetamol 650 mg as required but not more than thrice a day.
4) If you notice any other symptom which is new, please feel free to get a consultation from me.