Handwashing Laundry with Chronic Pain and Fatigue

A little back story, I have to handwash my laundry because our washer broke recently. Last night my chronic pain and fatigue flared up really badly and hasn't gotten any better but both me and my partner are completely out of shirts so I have to do a load and shower tonight no matter how painful it is or tired I get. Our bathroom is also pretty tiny because it's split up like a hotel bathroom with the sink in an open hall and the bathtub and toilet are crammed in a little room with just enough room for the door to swing open next to it. Does anyone have any advice on how to make bathtub laundry as easy as possible? Or anything I could get to make it easier later?