You are suffering from hormonal changes causing Androgenetic alopecia causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please  send photos of your head, by direct online consultation for accurate diagnosis and proper treatment.

Hair fall is both subjective and objective problem,  and the cause should be assessed, and the scalp should be examined.   Various reasons of hair fall from stress,  hormones to seasonal as well as dietary causes and many more,  it's important to analyze,  assess and diagnose and then treat accordingly.   Please see a specialist in order to determine what will be the best course of treatment for you.