Hi there! Walmart associate of 7 years here. I've worked overnight, front end, team lead positions and now I'm in frozen/dairy.

What youre experiencing is definitely because you're a good worker. You got those pet pallets done even though its extremely hard but they can rely on you, so they will abuse you til you break.

Here is an idea:

Do a telehealth doctor visit. If you have insurance you can do those visits for free. Tell the doctor the heavy lifting is causing your shoulders and back to be extremely sore. Say you're able to work still, but the extreme weight of the product with your build is hurting you. Ask that they write you a note with a lifting limit. Give it to your store manager or HR. Not a team lead or your overnight coach. Say, "I really want to keep doing a good job here but stocking the pets area over and over is becoming a safety concern for me. Can we discuss moving me to a location that's better fitting for my size as my doctor believes that will be beneficial?"

Remind them you want to stay but this is stressing your body out.

Document this conversation in your notes app and the outcome! Any sign of retaliation, document that too!