I’m so sad to hear how you are and have suffered. Many years ago I got two one inch fissures in my rectum and it lead to two years of pain that only God could describe. The reason I’m bringing this up is because as far fetched as this may seem…I’m wondering if you might have part of the problem that the fissures started in me. When there is a tear in a muscle it starts a spasm in the muscle. I got terrible muscle spasms in the sphincter muscle in my rectum. I’m wondering if some how something has set off that sphincter muscle spasm in your rectum. Crazy but an easy way to find out is to get a doc to prescribe a muscle relaxer named Cyclobenzapr. It is non narcotic and it’s the only med I’ve taken to stop it but it stops it immediately. Good luck.