Hello it is normal to feel anxious when symptoms persists despite negative testing . Firstly i would like to clear that sometimes these tests turns out to be false negatives.
Further i would like to hear more from you regarding the symptoms for eg what has been the type of fever - timing, duration, low /high grade, associated symptoms- vomiting , headache , burning sensation during urination , bowel habits , is there any cough cold associated or not ?
Also describe more about the abdominal discomfort you are having- site of pain, duration , intensity, associated with any other factors causing it to relieve or aggravate, migrates or not ?
Also please mention your city state if any local endemic disease might be prevalent in your area
Next Steps
For now you can also have Routine Urine examination( Urine R/M) to rule out UTI , a basic
LFT tests to see if any
Liver enzymes elevated to rule out Hepatitis
Continue Paracetamol for symptomatic control
Maintain adequate hydration adequate rest
If any other symptoms develop you can surely ask out
Health Tips
Would also recommend a consultation either with your family physician or here on practo