Dear Pr majda,

do I understand correctly?
In the first episode the hair loss was slow which means the hair follicles got weaker during a time of stress. (New brain stress = "minus-reaction")
but then the sudden loss of hair appeared AFTER a strong sympathetic activation like an emergency? This would mear that it happened at the beginning of the regeneration phase. This happens when the follicles that were already weakened during a stress phase are suddenly flooded with blood and lymph cells, and it's like a flood devastating a garden: the energy is too strong and the hair don't have a hold.
Even your autonomic dysbalance shows that the shifts are quite big. Certainly, if you attended an emergency all your energy was completely focused on that, like a river being narrowed, but then when the rain comes the borders burst!

Of course, when you feel and see this happening, this again is a new stressor  for your need for performance to satisfy, keeping your image. In other words, the hair loss becomes a self-devaluation and anxiety conflict of not looking nice enough. This creates a chronic pattern. 
As more themes are involved, other tissues react as well, as the lumbar spine which is about self-worth and support. 

Besides understanding this biological pattern, what you need is to feel more balance inside and to become aware of recources available to you, that help you to decrease the stress in the future. Your suggestions meditation, self-esteem, lifestyle, expression of emotions are very good, especially your self-esteem as you know that your hair is able to regrow. The flood that comes after the big stress doesn't need to come if you are confident and don't mind so much about things that don't define you.

What feeling do you like your scalp to have? Where do you already have it in your being?