The rectal pain which your suffering from may be due to the amebiasis
. Other reasons which can lead to rectal pain in your case can be because of Hemorrhoids, which is very common and since you are having the problem of chronic constipation
also, this can aggravate the condition of Hemorrhoids. Hemorrhoids are painful swelling of a vein or veins at the anus is a common problem. After rectal examination
only it can be diagnosed and depending upon the degree of hemorrhoids treatment can be done. Presence of 1-2 pus cells in per hcf is not very significant. I suggest you to have your rectal examination along with the treatment for amebiasis and make confirmation if there is any problem of hemorrhoids.
Thanks and take care