Thanks for the query.
Surgery is the only modality for fissures.
Its good you are going for it.
It is usually done under spinal anaesthesia
so pain wont be much.
However you may be kept nill orally for few days.
Recovery will depend on the type of procedure done
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.