No change even after laser spincterotomy

Since a year I'm facing fissure problem and I used to eat normal south Indian food with fibre in my diet and also very less mirchi powder. But Of No Use. I drink almost 1.5-3lts of water per day. The only solution to heal these fissure is to get relieved from constipation (hard stool). I don't understand what to eat and what not to eat. Fed up with the painful situations and Recently I have decided to go for surgery. It's been 2 weeks I've gone through laser surgery for fissure. It's very painful to say that still I'm facing the same painful situations and even more now due to the cuts, pus at anal area and swelling after surgery. Cremaffin laxative doesn't work. I used to sit only in hot water tub and not the actual sitz bath kit. Is it ok to just sit in normal hot water tub? How do I get rid of constipation (hard stool)? Can anyone please give me south indian diet chart? What makes harder large stool to become soft?