I don't know how effective this will be for him if he can't sit down, but I broke my tail bone years ago and was given a rubber blow up tube that you sit on to cushion by rear end. You can find them in drug stores or medical supply stores (sometimes also on line in those stores). There is also an over the counter lidocaine patch that you might try. When my feet or back are in so much pain I can't sleep from peripheral nerve damage and nothing else helps, I resort to the lidocaine patches. They come I. A box of rectangular patches that you peel of the backing and stick on the area of pain on your body. The medication lasts for about 8 to 12 hours of relief. Another brand is called Salonpas. My pain specialists told me about this stuff many years ago and it has been helpful some times. Hope this information is one of many things that might give some relief, Bless you, C.J.