I wonder if you've tried the no sugar approach suggested above - it sounds a pretty tough thing to do but I'm sure that if you had an improvement it would be worth it. Homeopathically, there are some remedy pictures which have itching when getting warm - a homeopath would need some more information to prescribe with greater certainty - if you don't have any luck with diet etc then I'd recommend seeing a qualified homeopath.

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Steve Ashmore BSc LBSH RSHom
steve_ashmore@homeopathy-soh.org
www.glastonburyhomeopath.co.uk