Elevation where relevant, above heart.
Instead of ice, Picnic packs of gel and plastic marbles. they mould to shape better and are not so hard as ice
For back pain, some times it helped to use the weight of my head to stretch my spine, by kneeling/not kneeling one side of a kitchen chair with head and shoulders drooped over the other side. Alternatively, hanging over the back of the sofa.
Gel for lots of things. Shoe insoles, better than foam. Making softeners for leaning the hand on a crutch handle (Best of all is a sheet of what looks like oxo cubes on a roll)
Always get shock absorbing ferrules for crutches.
Use arm crutches and arm walkers/rollators if possible, so as to avoid wrist injuries
BE OBEDIENT. Decades of chronic pain habituate into ignoring the messages from your body.
Fine, if the message is telling you something not worth knowing. But, often, you are ignoring a perfectly valid alarm bell going off.
Experiment with the novelty of listening to the information you get, because permitting yourself to pay some attention to the pain may give clues on avoiding doing what makes it worse, which may not be instant, so it needs a considered thought process and analysing what could be a connection.
e.g. Oddly, my back is willing to let me put a damp mop round the floor, but absolutely will not stand for something in the movement of using a vacuum. There must be something similar, in the twist of leaning down to the bottom of a supermarket trolley, and unloading onto the belt. These two things are totally forbidden, by my spine, though the physical movement is possible to make. If I stupidly try to make an exception, then hours later or for the whole of the next day, I will regret it. Merely ignoring pain would never have given me that
pain-avoiding tip.