For 2 weeks I have been itching all over my body with a prickle burn no rash, how long does it last allergy tablets don't work I do take iron tablets

Hold all medicines. To start with, although iron preparations usually don't cause allergy, could be a preservative or a non active ingredient, watch what you eat as well, can use a different antihistaminic, above all you might be having a dry skin, use a cream soap, moisturize your whole body right after bathing, every day or every other day, if all don't work, see your doctor, goodluck.