Which is the best shampoo for damaged curly hair with hair loss and dandruff.?

i have curly hair with dandruff and itchy scalp. my hair became very thin due to hair loss. when i scratch my scalp with nails itchiness increases and a lot of hair sheds. Due to chemical product for dandruff my hair became very weak and damaged. i want a shampoo that will reduce my hair fall and dandruff and will straighten my hair. please help...Which is the best shampoo for damaged curly hair with hair loss and dandruff.?
hmm i would suggest the refresh head and shoulders shampoo and conditioner. also i used to straighten my hair ALL THE TIME and it was so damaged but i wasnt ready for a hair cut yet so i found this stuff by herbal essences called, Long term relationship leave in split end protector for long hair. It doesn't only protect your ends but i renews your hair and leaves it extremely soft. If you are able to get a trim i would do that first though.Which is the best shampoo for damaged curly hair with hair loss and dandruff.?
I personally prefer Propecia. Propecia is a prescription only tablet that increases hair growth on the scalp and prevents further hair loss in men. Men with mild to moderate, but not complete hair loss, can benefit from using Propecia. Propecia is for use in men only. The active ingredient in Propecia Tablets is finasteride. In the scalp, Propecia specifically lowers the levels of DHT, a major cause of male pattern hair loss. In this way, Propecia helps to reverse the balding process, leading to an increased hair growth and prevention of further hair loss.