Here is an update. The recovery was very quick- and the first BM was bloodless! I was so happy, everything was very loose down there but in a good way. That lasted two weeks.

Then I had a BM after which I saw blood - I was a bit shocked but thought it was normal. Next day - again, and again and again. Finally I went to the doctor, he poured some chloric acid around the fissure to burn old skin, I presume and that's where it got much worse. Hurts more and more blood.
It has been a week since that acid treatment, I am not better, but today I noticed another symptom. When I use diltiazem cream, I felt a very strong "piece of string" piece inside the sphincter on the lateral side right where the incision was. I never noticed it before, never had it before the surgery and I think it might only be there when I am about to have a BM. I think that this tight thing is responsible for the retear. Even applying cream did not do anything to it. There were a lot of blood today.
I wonder what could it be? I think it is either the scar tissue from incision, but doubt it since incision must have been felt all the time, here it felt like I a muscle. I think that what I am feeling is either scar tissue on the muscle or the muscle itself.
Anyone?