Dear Katia72 hope you are a tad better.
My CRS mentioned she has done colostomy but only in the context of inflammatory bowel disease with fissure. She said it is not a treatment she offers for fissure alone - the reason for the colostomy was related to other underlying causes.
However I found and old thread in this forum discussing colostomy. I am not sure how to drag and paste it here . The most recent was a thread in 2015 and has colostomy in the topic maybe you could use the search function. I see some of the current moderators were involved in that discussion and maybe able to help you,
It seems hard enough to get a follow up appointment but wondering if you should get another opinion for another CRS for your options if that's possible ?
I have had relapses after 2 LIS myself though each surgery gave me years of benefit and am going through Botox now.
To be honest have had some desperate moments ( many) I find that turning over a new leaf in the things I eat and how I hydrate probably helps me the most.
Hope you do get better - take care.