Hair loss Can happen due to several reasons like dandruff, nutritional deficiency, stress, hormonal imbalance or even use of harsh hair products.
Since you also have dandruff and rough hair, the first step is to Control dandruff with a mild medicated anti-dandruff Shampoo like ketoconazole - based, 2-3 times a week)
Avoid frequent oiling if dandruff is Severe, as it may worsen flaking.
Next Steps
Include more Protein -rich foods (eggs, pulses, milk), green- veggies plenty of water in your diet.
Avoid Tight hairstyles and excessive heat treatments.
Health Tips
Hope this helps.. For further queries, consult me on
practo.