How can I get soft hair?

I made the mistake of getting my hair dyed a much lighter shade, and it was so ugly I had to get it dyed again a few days later. Now my hair is extremely dry and I can't straighten it properly. I miss my old hair colour and now I also have to deal with a broom on my head!! Does anyone have any tips on how how to replenish the moisture levels? I'm desperate at this stage.. It's brought my confidence way down. :(