prickly feeling?

it used to just be at night but now i get a prickly feeling on my shoulders and sometimes on my whole body ..i think its related to milk as it goes away after feeding.. any ideas what it is or how to fix it..mw has no idea...but said it will settle soon....maybe worse today cause its the first time went out and about (just to school and walked around and back) i feel better if i get under blanket but i think its a comfort thing as i am not cold (or hot) first time i got it was the day my milk came in..

its mostly in my shoulders where i had a weak feeling during most of my pregnancy...any ideas? its more annoying than anything else!:)