I went to see the colorectal nurse-practitioner today. Actually, I feel fine, and have felt fine for nearly a week, but I thought I'd go anyway.
What a bummer, she said the fissure is still there. I asked her why it's not hurting at the moment, and why I've had several pain-free months. She said it's probably a cycle of opening with any trauma, and then partially healing again. I don't think they really know, but I'll buy that for now.
I relate my two episodes of pain to stress (the first one) and diarrhoea (the second one). She agreed with both of those, and suggested that I keep a diary of stress and any other contributing factors. So I will do that.
I asked her about ways to reduce stress, but she didn't have much to offer other than yoga.
I can live with how things are. Even during the episodes, it's more soreness and a bit of pain during BMs. Nothing like the broken glass BMs and the agonising spasms I had last year. I really am OK for now. If the episodes get worse or more frequent, I might have to consider more drastic action.
I'm going to keep on with nitroglycerine for six weeks and then re-evaluate.