Welcome to HCM,
You can continue Cremaffin
for long time till your fissure gets completely healed.
Cremaffin does not absorbed in blood so it is safe.
Continue diet and fluids as you are doing.
Avoid fried, chillies and junk food.
Go for exercise and abdominal recti muscles exercise daily and regularly, this will increase your bowel movement and so constipation
can be avoided.
Ok and bye.