My body is worn out from years of warehouse picking. What do I do?

Your body kept its side of the bargain for years, and now it is asking for something back. Listen to it. That pain is not weakness or complaint; it is the honest record of hard work done well. You have nothing to prove about your toughness. You already proved it. The skill you have will outlast the rates. Knowing a floor blind, never missing, that is real. But your body is the one thing you cannot replace, and no shift is worth breaking it for good. Protecting it now is not giving up. It is being wise about what is truly yours to guard. Start by taking one ache seriously this week. See someone about it, or change one motion that hurts. You do not have to fix everything at once. You only have to stop pretending the bill is not real, and begin, in one small way, to pay yourself back.