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 for accurate diagnosis and proper treatment.

We need to 1st control the excess shedding and then focus on the regrowth of hair. Hair treatment is a slow process and it takes a few months for the density to improve again. If you want to start with the medical treatment you can get in touch with me through online consultation so that I can send you the prescription. ..... Also, need to get your scalp properly examined to know whether the excessive flaking is because of seborrheic dermatitis or an inflammatory condition like psoriasis. Kindly do not delay the treatment and get a consultation done with a qualified dermatologist. You can send me images through private online consult for a better assessment of the problem and approaching it accordingly. Hope this is helpful.