I have the exact same problem, and I was told that it was Rhumetoid Arthritis. I feel like both my legs are getting worse now too, and sometimes my feet. I am looking for a good pain management Doctor, so that I can do physical therepy. I find, if I don't walk, I get worse and I need to get past the pain. Also, lack of sleep is becoming a big problem. I ask my Doctor for sleeping pills and at least I get the necessary hormones while I sleep, so I can cope better with the pain. Good Luck!