My hair has recently been bleached blonde but it has ruined my hair so much so I wanted to gradually get it darker by using a dark blonde and then going to a light brown can I do this? I want to use over the counter dyes becos going to the hairdressers is too expensive

I think since your hair may be little weak or damaged you should probably put a rinse in instead of a dye. It won't last as long, and getting the right color could be tricky but it is an alternative to further damaging your hair. Your hair NEEDS moisture by the way to combat the drying effect of being bleached.

Do you mean a semi permanent dye? It might not take well to it if its one of those :/ I don't know but my hair is now blone and ginger and so dry its horrible my natural hair colour is dark brown :/