I am going to have a chat with the surgeon next week. I doubt I would be allowed to drink or eat anything before the enema, if one is required. I also probably won't be able to have much more than water or chicken broth after the surgery.
I'm going to ask if I could take a non-opiad intravenous painkiller ... one that doesn't cause constipation. It is causing me so much anxiety worrying about whether I am going to have an IBS attack when I go for surgery. I have been stable for so many years. I shudder at the thought of returning to my unstable days. I would rather endure a little pain to avoid an IBS attack because it inflames my tummy and takes weeks to recover.
I will try and keep you posted. I hope everything is going well for you. I hope we can meet one day in person when I am visiting the west coast. I still make trips several times a year to the San Francisco/Bay Area. Perhaps one day I will make it to Seattle too!