Please tell me about the risk in recurrent stoma closure operation.

Hello doctor,

I am 49 years old and suffering from adenocarcinoma in the rectum for the past five years. The doctor performed ileostomy, after that, I took radiotherapy and chemotherapy Pholfox 6. After that, I was declared free from cancer on the basis of PET scan report. Next year, I was admitted for stoma closure, but again opened it. A year later, again faced operation of stoma closure by same doctor's team, but was not successful and it is still open. I am facing so many trouble in my daily routine and now body weight is 106 pounds. I had all treatment from renowned hospitals and doctors. My GI surgeon again advised me for closure operation since 18 months and assured me to operate in a different way to get success, but some other medical expert asked me to wait for 2 to 3 years for recovery and maintain stamina. Kindly advice me about risk in stoma closure operation. The problem that would be faced after operation (due to a narrow route of the rectum). Are my all procedures were in the right direction? and reasons behind continous failure of closure operation. Is there any abnormality that would occur after the operation if a large part of the intestine is unused since a long time. Any further advice please.