Allergic reaction?

I decided to go blonde.

My hair was in VERY good condition before hand.First I used color oops.
My hair was turned an ugly orangey color,but I expected that.

Then the next day,I used Loreal high lift color in lightest ash blonde.I left it on 45 minutes.
I was still kinda orangey,and my scalp kinda burned while it was on.

Stupidly, I used it a second application the day after that.Now my scalp hurts and I have a rash around my hairline and a blister on my ear that is oozing.

My hair is blonde,but it is kind of ugly because it looks too yellow.I'm scared to dye it again though because I think I developed some kind of allergy to blonde dye (never had this problem with brown dyes).  I used to use this product all the time and nothing like this ever happened before.

I finally have my hair blonde,and now I don't even want it because I'm scared of having this reaction again.
What should I do?
Obviously I cannot color again until my scalp and ear get better.