Thanks for your query.Based on the facts that you have posted it appears that you have burning after passing Urine .
This is most likely to be due to infection of the Urinary Bladder
Please get your routine Urine test and ultrasound
scanning of the urinary system
done to confirm the diagnosis.
Please take some antibiotics lilke Ciprofoxacin along with urine alkaliser like Citralka (Which you had taken earlier) . for one week.Ensure to drink more water to keep your alkaline.