Well my condition in the limbs legs inner ankle/foot/calf and now sometime knee. I get a throb feeling like my foot has been run over. Anyhow to the point sometimes I feel the nerve is connected for ex if I touch my knee in a certain place I can feel it in my ankle. So I wonder if your arm pain is radiated to the fingers? Or if you are moving in a way to protect it and it is making your fingers hurt. These are just some thoughts that came to mind. Do you have any doctor apt soon cause I would explain to him your new symptoms. I always get fearful for myself I will brush something off as nerve pain or a flare and then it will be something different. I hope you feel better