Thanks for your queries at Doctor Spring. There can be a few possibilities for the dry brittle hair that you are describing. Nutritional deficiencies can often cause the hair to become dry and break often. There is a condition called PCOS or polycystic ovarian syndrome that is associated with hormonal imbalances, increased testosterone levels, and hair loss. Consider this diagnosis and discuss with your local physician, preferrably endocrinologist, the possibility of the condition.

You may benefit from combined oral contraceptive pills which can help balance your hormones and treat associated hair loss. In the meantime I suggest the following.

1. Include more good fats in your diet as this can give your hair strength and luster. Incorporate avocados, coconut oil, butter and nuts such as almonds, walnuts etc into your daily meals. Keep a watch for calories however, but understand the importance of a balanced diet. Eggs and other protein rich foods can also strengthen the hair and improve hair quality.
2. Shampooing too often, especially with harsh shampoos can worsen this phenomenon. Try to avoid washing your hair often and only wash once or twice a week using mild organic (sulfate free) shampoos and conditioners.
3. Adequate exercise (along with diet) is an excellent way to manage your hormones, help you sleep better, keep you healthy, and thereby eliminate stress that can worsen your condition.
4. As mentioned above, talk to your endocrinologist about starting ocp's.

The combination of above efforts can help to reduce your hair loss and ease your frustration. Please ask any follow up questions if necessary. Take care.