The only things i've heard of that might help with the itch are trying the over the counter antihistamines or antihistamine hydroxyzine (Atarax), anticonvulsants (e.g. gabapentin, carbamazepine, phenytoin), antidepressants (e.g. amitriptyline, paroxetine, mirtazapine), and even Pregabelin (Lyrica)....the only personal tips i have to offer is what ever you do 'don't scratch' and i found ice packs often helped, the cold temporarily overrides or confuses the nerve signals, worth a go if you haven't tried any of those potential solutions yet.
Hugs....JJ