What to do with my hair 5 months after chemo? Hair dyes?

Hi,
My hair is fairly thick now but still very short and a bit wavy, especially at the back, puffy on the top,flicks out at my ears.
 l am hating the colour, it is such a weird salt and pepper colour with a tinge of red. I did not have this much grey before,
l am a natural redhead, l did get a few foils in my hair regularly before l lost my hair from chemo. 
Will my hair go back to it's original colour or am l stuck with mostly grey hair now?
How safe is it to dye my hair and can l expect to get the colour that l want?
I will go to a professional.
I would love to hear from those that have coloured their hair after chemo, how long after and what results they got.
I hate looking in the mirror, l feel as if l have lost myself.
Cheers,
Karen