Hair Dye Disaster, Please Help!

Hi All,

I am new to the board.  I am a tone on tone blonde.  My colorist uses a base level 10 with bleach highlights.  Yesterday, I went in for a routine touch up, just the roots, no highlights and my colorist messed up and used the wrong color (he claims that it was just a faulty bottle of color) and my scalp immediately started burning. I asked him to wash it out right away. He then applied a different brand saying that it wasn't the wrong color and that I was just having a bad reaction to that brand which is odd because we have always used that particular brand (Goldwell) on my hair. Anyway, he tried Redken and, again, my scalp was burning, really bad. After a couple of minutes, I demanded that they wash it out.

After my hair was dry, I could see that it was a much darker blonde all over and the blonde highlights which were once golden are more white looking. My roots are a horrible shade of brown with a bright yellow tint to them. As if that weren't enough, I discovered that I have small scabs on my scalp and it's still tingling. The salon apologized and offered to fix it at no charge next week, however, I'm so afraid that my hair might fall out or something. Is there anything I can use or do to help with the scabs and this tingling feeling? And do you think I can get it dyed again next week? I want my blonde hair back. It's the ugliest brown on the top and the color is kinda scattered all over. It's awful! Please help!