I discovered for me that direct heat is too much on my CRPS limbs, i found it aggravates my rashes. I gave up Epsom salts baths. I use magnesium oil instead. I line my bed with heating pads when I cannot get warm & snuggle next to them, but I avoid having them touch my CRPS limbs.

When the fire is insanely bad I line my bed with dollar store ice packs (in zip bags-the packs can leak) wrapped in tea towels. I keep the covers off my legs with a stool & slide in to my makeshift refrigerator without having cold packs directly on my limbs. It isn’t as fast relief, but it works well. I keep six of these big packs flat in my freezer-they last for hours.