I have extreme pain in my thigh bone since almost 2 months. When I walk as little as 500 meters, my thighs (specially the right thigh) start paining tremendously and I end up having high fever. Now the pain is radiating to lower legs as well. I'm also losing a lot of weight. I'm talking vitamin D tablets. A month back, my vitamin D was 18. The supplements seem to be doing nothing. All other tests were normal. What can be the cause and how should I get treated for this?