Those same nerves also malfunction in telling your hands & feet if they are too cold/hot & wet/dry. The nerves are damaged. These things are like frayed electric wires and aren't sending the right energy or signals to the right places, the right way. Things get distorted, don't work right, even fail.
Think of it like a computer...a bad program or circuit isn't doing it's job just rite. That's how your nerves are or aren't working with the whole. Some things will have to be sort of re-learned in a new way.
I am an advocate of getting PROFESSIONAL physical therapy...learning to do HOME exercises that can help you start, get and keep the circulation going and prevent the loss of what muscle strength and balance is left. You can even improve BOTH! Ask your docs, they usually don't think of it, but, don't say no either. Staying still only makes you weaker and more prone to falls and sprains. Under a good PT, you can be given good exercises you can do in small steps that add up & SAFELY. Slowly so you don't overdo and get worse. For example, a 2-4 lb [depending on strength] hand weight [from a big box store/on sale, of course] do a series of only 5 repetitions 3 times a day and daily add just one..till you can do 20 reps 5 times a day. Less stress, damage and you'll get there.