Hi, many thanks for the query!
You should get physically examined for P/R examination by your doctor.
It seems that you are having fissure, once confirmed, start stool softners first, because hard stools cause mechanical trauma to anal mucosa.
Locally apply lignocaine jelly for pain relief as pain causes excessive spasm of the anal sphincter muscles, tight anal tone, so inability to pass stools & further constipation
Sit in a tub containing leukwarm water, so that
anus is dipped in it, 4 times in a day.
Eat high fibre diet, green leafy vegetables, drink plenty of water.
Take antibiotics, anti-inflammatory drugs, Vit. C preparation with
your doctor's opinion.
Get your Hb, CBC done.
Wish you a good health.