I washed my hair with purple shampoo. My hair turned purple, what should I do?

I had my hair dyed light gray today. They bleached and dyed it. My hairdresser told me to use purple shampoo. I used the purple shampoo and I think I applied too much; now my hair is purple. Will it fade? Is this a temporary purple? How long does it last? Anyone who has experienced this, please advise.