I've been suffering from a nasty anal fissure since the start of June 2015. It started after the worst case of diarrhea i've ever had, which lead to a couple really large, really dehydrated stools.
At the time (and actually a couple of months before the hard stool that ripped my anal canal) i was suffering from very frequent urination, so frequent that i in fact would wake up 5-10 times in the night to pee.
I was used to eat a lot of fibers at that time, so having to pass bulky but relatively dry stools through a healthy anal canal wasn't so much of a problem. So i didn't had any idea on what was going to happen.
I must note that i was always a very frequent toilet user, i would go most of the times twice a day and always had very fluffy stools.
At that time though, frequent urination lead to body dehydration and to stool dehydration.
I started by eating lots of fibrous foods every day which lead to bulky stools but actually dehydrated hard like playdoh stools.
Anyway after 7 months going through diet schedule, stool softeners such as macrogols, lactulose and mineral oil and psillium fibers, which end up making it worse most of the time, i found a potential cure, which was Milk of Magnesia. That alone helped a lot on keeping the stools hydrated, and after using it continuously for 4 months every night, helped a lot to stabilize the anal skin.
Just recently (1 month ago) i eventually decided to stop taking milk of magnesia one night, and since then everything goes great.
Frequent urination made a huge impact on the situation of course and it seems that for uknown reasons it went away, like it first came.
I still had some issues with the area around the anal area, like itchiness when i was walking or getting sweat in there. I used sudocrem for that and it healed every leftover pain/itchiness in 2 days after applying 6-7 generous doses.
So i would like to leave some very basic advice to fellow sufferers who started to suffer recently and have no experiece.
In terms of food, i found butter beans, eggplants, buckwheat, apples & oranges to be most helpful.
Also don't overdo it with fiber, too bulky is too painful.
Between macrogols, lactulose, mineral oil & milk of magnesia, the last is the cheaper and the best for long term use. I've tried all of them, macrogols need a lot of grams and i didn't like the effect, lactulose was too weak, mineral oil would usually do the work but its messy and not so healthy. Milk of magnesia needs the right dose and it does the trick (the best for me was 10-15ml at night and every night).
Rectogesic didn't work for me, i had mild to no headaches but most likely didn't work because i didn't have yet solved the urination issue. You could as well skip it, since its expensive and could be useless.
Olive, coconut oil and other external use stuff didn't help me at all, i actually believe that, itchiness first occurred when i did a sitz bath with coconut oil.
Instead give sudocrem a try.
Painkillers are very helpful, especially those which help stop the swelling after BMs
I see that most prefer ibuprofen, my personal favourite is mesulid though. It does also have a anti-inflammation effect
Thats all, i might add some more stuff later