Cycle of constipation and tearing

Hi I am a new mom and breastfeeding my 5 months old baby. I am facing a terrible problem which I never had to in my entire life. I do have a BM once everyday but it is hard stool (apologies for being blunt) no matter what I do it stays this way. I have tried high fiber diet (still following it), exercise, increased water intake but nothing seems to work, I always have constipated stool (even though I go once everyday) and end up with a tear. I am depressed very depressed. I don't have any cramps or bloating or pain which might indicate other problems what shoul I do? Please help, it inly seems to soften when I use some type of laxative other than bulk laxatives which don't seem to work. Regards