welcome to Healthcare Magic.
It is difficult to comment about cause of hair loss and eye irritation
in your case. But one thing is clear from your description that your weight is very less. Malnutrition
can lead to hair loss, dry eyes
and depressive symptoms.
In your case, it is better to get investigated for low weight. Same time start healthy diet and weight monitoring.
Wish you all the best.
Dr Ashish Kumar Mittal