Yes, getting the bowel movements the right consistency, etc., makes us all feel a little like a mad scientist with all the combinations and concoctions we experiment with. And unfortunately while we're experimenting and trying to figure it out the fissure isn't exactly going on vacation until we get it sorted.
The ingredients are pretty typical for a hemorrhoid ointment. I would avoid it because of the vasoconstrictor. You want to promote healing of the fissure by increased circulation in the anal area, not constrict the blood vessels. The nitroglycerin, nifedipine or diltiazem all relax the sphincter and also increase circulation to the area.
You'd be better off trying something that is just emollient and protective until you can get yourself sorted with a prescription.