Hi there! We know your pain, believe me

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Your fissures are 'only' in the chronic stage, and this is the time to 'catch' them with a doctor who knows what they look like and what to do. This is the time to get it healed before it gets worse.
Are you seeing a Colon and Rectal surgeon? They know what is what when it comes to fissures. I was also prescribed suppositories in the beginning, by my GP. Painful and useless. What you need for fissures is either Diltiazam, Nifedipine (both calcium channel blockers) or nitro (Rectiv, or something at 0.2% made up by a good compounding pharmacy). Ask the doctor, sooner rather than later.
Have you got a Sitz Bath? A useful thing as warm water after a BM brings blood to the area (one reason anal fissures don't heal is the pressure there stops blood flow to the area, and heat helps to restore it). I only use my Sitz bath for a few minutes afterwards. I bought it on Amazon, but they are available at Rite Aid too (presuming you are in the US as you refer to fiber and not fibre).
What I do: never 'wipe', only pat with damp Cottonelle TP, and then I also pat with a damp and warm Johnson and Johnson gauze pads until everything is clean down there. Then dry GENTLY, pat a couple of times with Cottonelle paper and apply a LITTLE petroleum jelly (among its many uses, it is used to protect and prevent moisture loss of the skin of a patient in the initial post-operative period following laser skin resurfacing, so it's good on the delicate tissue of our behinds). When I first got fissures, I did not 'know' my arse...times have changed
Hope this info helps, and any more info, feel free to ask.