What are the dangers of secondary amenorrhea? I am 20

Patient: What are the dangers of secondary amenorrhea? I am 20 years old and 5’5. In the last three months, I have lost (intentionally) 20 pounds, taking me from 121 to 101. While I no longer desire to lose weight, I have become concerned because I did not get my period last month and this month as well. What risk am I in? Also, is there a way to restore my period without gaining back weight?

Symptoms: Lost period due to weight loss

Doctor: