OMR,
I'm sorry to read that you have retorn so quickly after your surgery. It must be frustrating after having the surgery but please don't despair. I haven't had the experience personally but after reading a lOT of posts on this, can reassure you hopefully that having the LIS procedure itself will help you to reheal the fissure a lot more quickly as your CRS says. There are others here who have suffered exactly the same thing as yourself but have also been prescribed the same creams to assist the healing again and been very successful in fully healing.
Just be sure to continue with those really good lifestyle and dietary habits you have been forced to adopt, keep your body well-hydrated and I'd also recommend applying a generous dollop of Vaseline around the anal area before you pass a BM to help protect & lubricate the area. Zinc & Vit C are excellent in wound healing too.
It takes a long time for a fissure to heal generally because that area is so incredibly fragile, so just continue to be careful, but LIS really should help speed up your process.....Fingers crossed, you get through this quickly and are soon back on track :)