Breastfeeding mommies i need your help

Ive been pumping after feeding my little one and here lately it seems i can barely pump any, is this one of the "let downs" ive heard of happening? It also seems that breastmilk just flows freely from my left breast but not my right. My left seems to produce more... What can i do to fix all this ??? Please help😁😁i plan to switch to exclusively pumping once i have to go back to work so i dont want this to happen and me not find a solution.