JHH you are not alone we all worked out our minds to the point of going crazy before the doctor tells us is just a fissure.
I guess you may be getting the sentinel pile that is so usual when you have a fissure for so long and sometimes the scar tissue also get to do its magic and give us some scare time also.
Hopefully the cream the doctor give you will help, I also got a painful re tear the last time the doc decided to puck more into the fissure last Nov, manipulating the skin tag caused me to go back into spams, pain and bleeding.
Last month my app was no as bad. Keep the stools soft and easy to pass and keep using the cream.
Perhaps next app you will be healed and life will go to normal again.