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 more photos of your head, by direct online consultation for accurate diagnosis and proper treatment.

There are multiple causes of hair fall like hormonal, nutritional deficiencies, thyroid problems, drugs etc. Detail history and laboratory tests are needed. How many hair are you loosing per day? In the above mentioned picture the density looks normal.