:-( help please

I put blonde highlights in my hair over the summer and the sun turned it a blondish color. I hate how the roots grow throw and i want it back to my original color which is a light brown or dirty blonde. What would you suggest i do to get it back to my natural color? i hate how the roots grow threw. My hairdresser said to dye it 2 shades darker than my natural color then it will fade into my regular color. Should i do that? Thanks very much!!

I tried to die it close to my natural color a couple of weeks ago but it turned out a color i dont like. I dont have any of my natural color left so i figure if i just dye it darker then the roots wont be as noticible when they grew through. I did this a few years ago and it worked pretty good. I am just afraid that the dark dye will turn my hair a greenish color because sometimes it does. I am going to go to a salon and have my hair stylist do it but do you think it will turn greenish? thanks for your help!