1you are suffering from first degree piles-haemorrhoids. It is not fistula.
2. Hard toilet means constipation
which is a lifestyle problem and not a disease. To treat, 1. Increase fluid intake, 2. Takr emolient laxative like duphlec sy or cremaffin plus 1 tsf at night, 3, take naturrolax grannules or isabagol powder 3-4 tsf in at least 300 ml. Of water, 4. Apply zincal ointment twice a day inside anus, 5. Take high fiberand high redue diet
, 6. Avoid taking pain
killers so far as possible, 7. Increase physical activity like4 walking, playing physical games or exercises regularly, 8. Keep regular hours of sleep and food.