I had about two weeks to spend getting more and more worried about the surgery. I kept myself busy, since I've been mostly symptom-free for the past few weeks. I went ahead with the LIS because my surgeon and doctor were fairly sure that even if this current fissure had healed up (which it hadn't, turns out), this would most likely become a recurring issue.
I went in today at seven in the morning, very tired because I hadn't slept well at all last night, and was positively terrified once I got settled into the wait room with my partner. The surgeon was backed up with an emergency he had to take care of before me, so we had an extra hour and a half to sit and fret. Since I hadn't slept much the night before and my partner hadn't either (looong overnight shift), we just sort of curled up on the bed and drifted in and out of sleep. Had to take a fleet enema at one point, which wasn't anywhere near as bad as I expected, though every bit as effective. There were about a half-dozen times where I honestly considered trying to bail on the surgery, but with the support of my friends and family coming in on my phone during the wait, I managed to stay put and prepared.
When the nurses finally came, I can't lie. I was scared

They told me they had performed the LIS, a fissurotomy, and had found a small piece of tissue that they removed to examine further. I've been pretty groggy, and definitely a little dim-witted, but I think that's probably a mercy. Keeps me from overthinking everything I've been through today.
It's now about 5-6 hours after the operation, and I haven't taken the Norco (hydrocodone/acetaminophen) prescribed to me yet. A little nervous about the constipating effects of the hydrocodone on top of everything else they gave me during the surgery, but I think I'll probably take one soon just to keep on top of any pain that might be coming later. Just took some milk of magnesia to try and offset the pain meds. Aside from some pretty mild nausea, I can hardly believe I even had surgery today.
Anybody out there have any tips on when to start taking a look under the gauze, how to clean, etc.? I've read a bit about cleaning with just coconut oil, but different places say different things. And one more thing - a million thanks to all of you, for your experiences and your support to others dealing with this. Finding this board has been a tremendous help for me, as I'm sure it has been lots of folks. Y'all are the best!