Welcome to the group! Sorry to hear that you are in so much pain. You need to see a colon and rectal surgeon (CRS) to get a good idea of what is going on.
We are not doctors on here, so think that your doctor seeing what is going on with your rear end is best.
There are quite a few photos on google that show exactly what an anal fissure looks like.
We provide advice, but we do not diagnose. We understand the pain as many of us are going through the same process. But, as to what is going on with
you personally, that is something to show your doctor. This is what we all have to do.
All the best to you, and keep us informed!