Husband with many allergies and sensitivities and has difficult side affecnts with antihistamines has had hives for almost four weeks. Been muscle tested, using supplements, indluding natural antihistamines that usually work better,.MD gave Hrdro cort shot, bad reaction to that, gave Hyroxyzene pills, bad reactions to that, any time the meds or supplements wear off, hives come back. Have changed to natural detergent, nothing else changed in past month. can t determine what the cause is and a better solution