I think you're meant to take anti-histamines every day. They never work for skin irritation for me, so it's hard for me to judge. (I've taken them for sleep and do get effects there, but not really the ones I want.) 7 weeks does sound like a long time to be adjusting from stopping chemical dyes, but then I don't really know much about how the scalp behaves. What have you been using on your hair in the meantime in the way of shampoo (bars), conditioner and so on? I think the options are either a) it does in fact take this long for irritation to settle after using hair dyes; b) you have a fussy scalp and are (now) reacting to something in your shampoo, or c) it's not contact dermatitis, your scalp is itchy for other reasons unrelated to what you put on it. Or d) any combination of the above, of course.
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