My husband suffers from chronic hives. It is a miserable condition. He is consulting several doctors with no luck so far. Tests show he is low Ig, in the past he has been low vit D and taken supplement-not sure where that stands now. He is and has been for years, always cold but hot conditions make the hives worse. His famiky dr did one thyroid test with a normal result, not sure which one. Any experience with this? Thoughts?