The drinking part is not the worst. Stay close to the toilet and have plenty of toilet paper handy. Also, if you're prone to hemeroids, take appropriate precautions. Just had my 1st. The actual procedure is nothing; you're asleep, and there's no pain afterwards (and I even had polyps removed). You've been through much worse. You'll do fine with it.
My brother repeter went through this. I know what to expect. I'm just whining.
But thanks.