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.

Stress and genetic factors both can lead to hair fall. Better take proper consultation with a dermatologist for your concerns

Hello dear. Your history of eltroxin intake is suggestive of hypothyroidism. Hairfall is common in hypothyroidism. Unless your TSH level comes in normal range, hairfall will not stop. However, there are medicines which can control the rate of hairloss. Kindly consult online for proper evaluation and treatment