Hello Pr majda,

thank you for sharing!
Regarding old brain and new brain, the ((Integumentary - Skin - Hair|hair loss)) is an issue of contact and self-esteem (= new brain) which has a "loss of function"- response upon its stressor.
Obviously, the theme is recurring, because you experienced complete re-growth but also re-losses, and the reaction also grew from patches to general.
You describe to have had many conflicts in adulthood, but the soil for these conflicts, as for the hair loss, was already there since younger age. So we know that the sensitivity for a loss-of-touch-conflict regarding your head was created earlier. Do you know whether other family members also had alopecia?
When you were eager to study and get good grades, what made that so important?

Acne is an "old-brain-way" of dealing with the feeling of vulnerability. The body creates a gain of function in the ((Integumentary - Skin - Dermis (Leather Skin)|sebaceous glands)) in the skin. 

When we have both reactions in the sin - both functional gain and loss - there is an inner conflict between the longing for connection and the need for protection. The feeling of acceptance for yourself, your head and your looks, is promising for to heal completely. You are right, the itching is usually a sign of regeneration which we don't want to fear.
Have you worked with tapping on these issues yet?