I asked my CRS about what to eat and was told to eat a sensible diet. For me it was best to keep things soft but formed because anything loose at all burned like crazy. I was just using colace and eating lots of fresh fruit.
A retear would be no fun but any subsequent healing should be more rapid now. I had that sore feeling too, it's a good sign!
I'd just stay off my feet as much as possible for as long as possible this first week. You'll probably get an incredibly sharp itch in about three weeks or even sooner. Then a couple weeks later if all goes well, it'll be R.I.P. for your fissure!