My allergist told me that i can eat chicken breast once a week and also i can eat just the yolk of the egg. WHY??
You don't seem to have any history that would really suggest that those things need to be out of your diet, do you? I mean, you have negative skin tests. That is
at least 95% predictive of you having NO allergic response to them at all.
If you don't
remember your histamine control, then you probably don't need to worry about foods that might be high in it. Believe me, if you were dermatologically hypersensitive to histamine, you'd know it after a skin test that included a positive control. It would be
very memorable. The fact that it isn't is pretty suggestive that this isn't the problem.
I'm not sure that I'd be too trusting of a doc that wants you to limit your intake of something you aren't demonstrably allergic to-- particularly when that something is a thing that you have a negative skin test to on a skin testing session where you DID definitely respond to other allergens.
Does that make sense?