so I've been so itchy lately like my whole body. legs Arms belly butt feet hands just everything and…

so I've been so itchy lately like my whole body. legs Arms belly butt feet hands just everything and I told my Dr she said moisturize I have it doesn't help at all .nothing does . not cocoa butter not lotions Cortizone cream oat meal baths nothing. what can it be and what can help ? or what can I do ? please help I'm desperate I'm scratching all day everyday and it won't stop. it's stressing me out .