Thanks for your query.Based on the facts that you have posted it appears that you have fluctuating fever ,burning urination and swelling of the face.
All these symptoms are suggesting acute infection of urinary system
Please consult qualified Nephrologist
for clinical evaluation and investigations to confirm the diagnosis.
You may need to get following investigations done to establish the diagnosis.
1) Routine urine test with urine culture.
2) Complete Haemogram .
3) Renal function tests.to assess kidney function.
scanning of the abdomen.