Hi,
Have you changed your laundry detergent, pajamas, sheets or lingerie?
Many people have had allergies to a material called "Modal" - it's made from beechwood, and is sometimes combined with cotton. It's not the wood that's the problem, but the chemicals used to process it. Allergies to the "Cheaper" bamboo product are often for the same reason. Check any newer clothing articles for this, even outerwear. The allergy seems to spread really quickly.