The case history as mentioned in your post indicate that the hair loss can be attributed to excessive application of dye & shampoo.
However, other causes of hair loss which needs to be concerned of are:
1. Environmental factors
3. Deficiency of certain minerals, vitamins & amino acids in diet. e.g. Iron, zinc, Vit B complex, lysine.
factors. e.g. Thyroxine
5. Any incidence of surgery, shock, etc.
1. Treating the underlying cause
2. Avoidance of stress
3. Dietary modifications
solution to be applied locally to stimulate the hair follicles
& multi mineral supplementation
But these medications have to be used regularly under the guidance of a Dermatologist
, as hair loss tends to return on stoppage of these medications.
There is no need to worry.
Your hairs will grow back again.
Wishing you a Good Health.
Thanks & take care.