I am sorry to hear that you are still having problems after more than a month following surgery. I have no personal experience with anal fissures, so, I had to do a bit of homework to answer your question. Did you have surgery which involved cutting a small portion of the anal sphincter muscle to reduce spasm and pain and promote healing? According to the website for the American Society of Colon & Rectal Surgeons, "Complete healing occurs in a few weeks, although pain often disappears after a few days."
Please consult your surgeon. The purulent rectal discharge with a light green color and pain following a bowel movement are abnormal. You need to be evaluated as soon as possible.