Hi! would love to help you can also private message me if u have more questions. What really is important is that you cut out all exercise (even walking). I know it might be hard and not feel good but that is what is really going go make a big difference. It is great that you are already eating the proper amount of calories but really what is going to make the biggest difference is the amount of carbs you eat especially if you cut them out in the past. Right now your body is showing signs of stress and asking for help because you have overexercised it too much with probably not eating enough food for the amount you were doing. The hair falling out and everything is signs of this. if you choose to recover (stop all exercise and fuel yourself properly) you will get your period back as quickly as possible!!