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.

U could have begun with Male Pattern Hair loss. Its mostly a Genetic condition but certain conditions like stress can aggravate it. One cause of male pattern baldness is genetics, or having a family history of baldness. Male pattern baldness is associated with male sex hormones called androgens. Medication and treatments like PRP, Stem cell therapy is available to control the hair loss and regrow the weak hair. From the picture u have sent u will have to do a Hair transplant. It will also improve ur hair line gradually. Consult a Dermatologist