Hello. After childbirth I'm suffering from constipation, cracks appear…

Hello. After childbirth I'm suffering from constipation, cracks appeared ? Glycerin gives little effect, everything is very painful during defecation and after it They offered me Duphalac, who knows how many times to drink and how many ml? Please tell me! Is it really going to make stool soft (I'm so tired ? even to the doctor I wouldn't wish such pain?)