According to the history given by you there is possibility that you are having external piles may be associated with fissure.
Hemorrhoids are arteriovenous channels along with connective tissue
which help in passage of stools when they become pathological they became swollen and cause pain. Sentinal pile is only skin tag which indicate some internal problem.
Now what you can do is continue the treatment given by your doctor. As your stools become soft and constipation
gets relieved the pressure on piles decrease so they will subside.
As you are undergone cesarean section you have to avoid acts which will increase abdominal pressure like bearing down to pass stools etc. which will affect you sutures in side the abdomen.
So, in future also you try to avoid constipation by taking plenty of fluids, fruits etc.
If you are experiencing excessive pain you can take stiz bath means keep one tub of luke warm water add some disinfectant like dettol
and sit in it for some time, it will relieve your pain.