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.

This is androgenetic alopecia. It's a Permanent hair loss from the scalp, causing baldness. While the patterns of baldness for men and women differ, they both have a common genetic cause.With male pattern baldness, hair loss typically occurs on the top and front of the head. This thinning in men often starts as a widening of the temporal hair part that leaves the front hairline unaffected. Medication may prevent further hair loss. In some cases, surgeons can transplant hair or reduce the area of bald skin. Consult a Dermatologist for the same.