How can I fix my damaged hair?

and i thought i was the only one doing this in the world. i wash my hair every other day and i straighten it everyday. if i wash my hair everyday the dermatologist said that it would get really dry especially when i don't use the conditioner. my shampoo used to be loreal but then i switched to sunsilk. i was a bit skeptical about it at first but it actually made my hair really soft and i noticed that there were less split ends. i don't know, but it worked for me.