Fever with body aches, bone pain and pain behind the eyes together can point toward a viral infection such as dengue, especially if it's been going around in your area. The mild breathlessness and nausea are worth taking seriously even though your temperature reads normal right now.
Next Steps
Get a CBC with platelet count and a dengue test done today, and rest with plenty of fluids. Avoid aspirin or ibuprofen until this is ruled out, since they can raise bleeding risk in dengue. Paracetamol is the safer choice for pain and fever.
Health Tips
See a physician the same day if the breathlessness gets worse, you vomit repeatedly, or you notice any bleeding or very low urine output.