Anal fissures can be difficult to treat, and require some patience, but it sounds like you’re doing the right things. Soluble fiber tends to work a little differently for folks without colons, in that it helps bulk up the stool for most of us (rather than soften it), but it still should be fine with a fissure. If your ointment is nifedipine or nitroglycerin then it should help heal the fissure. In especially difficult cases Botox injections are sometimes used, but you ought to give the current treatments time to work first.