Anal fistula tends to persist for years. Surgery will only temporarily solve the problem and chances of recurrence are very high.
I do not know which Homeopathic medicines you are taking.
I want to know if anyone in your family ie parents or grandparents or siblings have had tuberculosis?.
Homeopathy alone can treat your problem though you need to take medication for long time.
Next Steps
You can consult me if you want.
Health Tips
Keep cleaning that particular area with warm water and dettol. Hygiene is extremely important. Eat healthy foods.