Thanks for your query.Based on the facts that you have posted it appears that you have pain in left flank since 4 weeks.and have taken antibiotics .
The pain is persistent in spite of taking medicines.
Your routine Urine test result revealed proteinuria
Looking at the nature and site of the pain it will be advisable to get ultrasound
scanning of the abdomen to rule out presence of Stone in the Kidney or Ureter
Please consult qualified Urologist
for clinical assessment and further treatment.