Hello and hope you are doing well.
The commonest cause for severe pain while passing stools is fissure in ano. This is characterized by a crack in the skin of the anus. Anal fissures may be noticed by bright red bleeding if acute they may cause pain after or with passing stools. The cause for the tear is usually hard stools. The first step towards therapy would be to combat constipation, which is done by drinking plenty of water, like doubling your usual intake. Adding a lot of fiber rich food in your diet like green, leafy vegetables and bananas.Consuming only whole grain cereals like rice or wheat and avoiding refined carbohydrates. Regularly exercising, as this helps in bowel movement. But if constipation is still not relieved, then a laxative can be used temporarily.
If it becomes chronic then surgery may be the option. Please consult your primary care physician for further evaluation.
Hope this helped and do keep us posted.
I have exact same problem after havin my son, over 2 years ago it was so bad I would sweat and nearly pass out from the pain it took over a year to ease with still an.out burst of pain about 1ce a month I've just found out I'm pregnant 10 weeks and I've been havin the pains again really bad I'm so scared, as when the babies born I know exactly what I've got coming more servear unbearable pain I.just don't know what to do