My bed is making me itchy?

Bed sheets should be washed at least once a week and more if you are sweating, or having sex in them. You probably have changed your detergent to something new. Tide and Dreft seem to be the most reliable as far as not causing issues with itching. Perfumes dyes and fillers can be very different from brand to brand and you can develop a sensitivity at any time, especially if your room is overly warm and more of your body is exposed to the material or if you are sweaty.