Yogurt - nothing ever constipated me since I do not tend to constipate - but still - I was on "fissure diet" 100 % and 100% of the time (not that it helped though LMAO) BUT - if you want to be on the safe side - you can mix some fresh fruits in : ))) !!!! Or prune preserve - yum yummmm ; ) OR apricot preserve - even more yummmmm LOL
Neuropathic - I was laughing about your sinus problems since it is exactly what I have now ha ha haaaa- 3 weeks of antibiotics and not MUCH improvement . "Gunk" is gone but they drip and some blood is there - I guess at this point it is chronic

. I now take Flonase since I need to calm down inflammation and it "almost" works - BUT - with pollen season just starting - we are doomed

Also - I was living off veggi-soups LMAO - that was my staple diet during fissure times...
Steve- tension of the body and tension of the anus are the 2 completely separate things. You can be relaxed as a dead earthworm but still have tense anus ! It has nothing to do with each other whatever people tell you ! And who could relax in any way with such a pain - one would need to have lobotomy OR heavy sedation. Some people are naturally tight in that area - anus is smaller then it should be or it is stronger than it should be and for those LIS or dilation are the only help - although I would choose LIS oved dilation any day .
BUT - look at the bright side - you have periods of day with no pain
:D :D :D - I had NONE . My pain was 24/7 - alternating with excruciating pain during pooping and burning and dull pain level 7 after pooping until next pooping ( and I went 4-5 times a day ). So...
Stay strong ; ))) !!!