Bitch of an Itch

Hello! So I'm in a bit of a situation, not quite sure what's going on. I just moved to a new apartment with my fiancé (YAY! Away from insane family!) but I seem to be developing some kind of crazy itch... My back, arms, shoulders, and chest, I scratch like no tomorrow... Spray bactine on to kill the painful itching. There aren't any bites or markings, the occasional bump but nothing consistent. I did have pityriasis rosea years ago but that has distinct markings. Anybody experienced this before? I'm not using any new products or foods... so I'm at a loss here.