Sensitive after allergy attack and question about hair dye/ing

The thing is, after eating some sushi the first week or so after getting my hair dyed last, I had a bad allergic reaction to the sushi. Ever since, even the most normal foods I eat provoke some kind of reaction in me from an itchy throat to a speckly red rash so I think it might be wise to not put any chemicals on my head while in this sensitive stage.

The thing is though, my hair really took to the blonde which, would normally be good but now I have regrowth and am not sure if going to the hairdresser would provoke another attack since I seem sensitive to even food and soaps right now.

I mean, nothing may even happen but because my system seems sensitive right now I may have to run around looking a little like a skunk. :p

Any ideas? I heard that patch tests are completely unreliable in cases like this.