need help plz

Im oriental and I had my hair dyed dyed a medium blonde but after 3 weeks I decided to go to get my dyed again but the lady that did my hair bleached it alot and its too blonde white. I didnt really liked it and i had to change it back to a dark color becuase the next day I had to go somewhere and didnt wanted a lot of ppl looking at my so I went to the the drugstore and bought a dark brown color so I can dye it myself. But now my hair is really dry and damaged now. Is it because I dyed it twice in the same day? Can someone help me with this problem...my hair is really damage and dry now. I also had my hair relaxed like a couple months ago so I think all the dye took away the relaxing affects. Is there any shampoo or conditioners I can use regular to fix this problem or is it better for me to jus cut my bangs off because thats the only part that I dyed.

thnx for replying...I am already using a mosituring shampoo from salon selectives. What brand would you recommend for a deep conditioner from a drugstore and can I find this Jojoba light oil in a drugstore too?

Also for the next time I get my hair relaxed or dyed again is there something I can do first like using a special shampoo or conditioner before going through it.