Just an update, the boil is slowly going! Been on penicillin to clear it and it's doing its job. Might be another week+ though.
In other news, I am ready to officially declare that I'm fully recovered from the operation. It's getting much easier to sit and drive, and that's great. However, the fissure is still very much present.
Some of my symptoms seem to be improving. It's now virtually painless to poo and occasional involuntary tensing of the muscles post-defection now results in an almost 'normal' sensation. Whatever that is. Who can remember?
Other symptoms remain with little noticeable improvement. Occasional sharp pain from deep inside (although it's hard to pinpoint) and frequent annoying prickly and sharp pains from within the anal canal.
I always had an unpleasant dull prickly, rubbing sensation from inside, at about the Pectinate line, that would make me want to tense up in defence. That was actually my most annoying symptom pre-treatment. When stool is ready to exit, I imagine it pressing against something there. This still remains, but has reduced in intensity. But this could be due to the regular soft movements. I'd love to know if anyone else had this symptom! This is what makes me think I might have an unnoticed internal fissure as well

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Either that or my fissure (1cm in length, according to notes) just extends far enough to be irritated by stool before defacation. I just don't know.
I'm going to declare the LIS a failure. I'm giving it until the 4 month mark before I go back to my CRS and seek further investigation. Tbh this is a relief, no more worrying about will it-won't it. Knowing I can seek further treatment if required at least gives me some hope