I have an itchy throat that never seems to get better and itchy skin that doesn't respond to antihistamine and hydrocortisone cream. I have been tested for common allergies like grass--no problem. I often have trouble with fragrances and some flowers like daffodils, but avoid them. Also allergic to penicillin. I'm avoiding all the triggers I know, but my throat seems to keep the itch and my skin, though it looks normal, keeps itching. Any suggestion for finding out what is triggering this? Thanks so much.