Perimenopause itch🥴🥴🥴

I'm 41 and it's definitely been downhill since turning 40. But recently my skin has been itching constantly. Back, arms, legs, every part of my body itches. I've moisturized, taken oatmeal baths, tried antihistamines and nothing seems to work. Is this a perimenopause thing?? Is there something I can do?? It's becoming unbearable, especially right before bed. Help!!