I realize this isn't for everyone, but if there are any cold water enthusiasts or curious to try out there, I figured I'd share.
So I started experimenting with cold baths for something totally separate, to help ease chronic lower back pain. I've only been doing it a couple weeks but noticed quickly that a rather pleasant side effect has been the relief it's given to my fissure. I now wait until after my morning BM to take my cold water bath and the results are immediate. Also it's kept my pesky skin tag from swelling as I'm in the midst of managing a re-tear.
It's certainly not a solution, but it has given me some relief.