This graphic (below, click on it to make it bigger) helped me understand what was going on. I have degenerative discs as do many older people. A detail nobody mentions or talks about, at least to me so it came as a surprise. After studying the spine and nervous system I happened upon this and realized why I had buzzing hot and cold legs, sometimes hands and arms. The only things doctors can offer are drugs that by all account don’t work well for most like Gabapentin and Lyrica both of which have exhaustion as a side effect and Anti depressants also exhaustion.. Plus Non Steroidal Anti Inflammation drugs like Mobic, Motrin and Neproxin for pain all of which are hard on your stomach kidneys and liver. The only thing my doctor recommends is losing weight and Physical Therapy which tightens and strengthens the muscles that support your spine. This makes sense. But with the exhaustion from all the other stuff it is difficult to stick with. Also you have to ease into it and not do anything that hurts. Stick to the ones that feel good. But your doctor should recommend what is best for you. All I can say is it is difficult to live with these common age related maladies and growing old gracefully is over rated.. 😜