There was no injury at all. I was driving my kids to school one day, and my left arm just got very heavy and fell into my lap. Ever since then, things have gone down hill. I've been seeing neurologists, chiropractors, and cardiovascular doctors. They've all told me that it's very interesting but that in all honesty, they are stumped. The cardiovascular doctor told me "I think I have an idea of what it might be...'sympathetic nervous disorder'" Which, he told me has many names CRPS, RSD, etc, and that if the nerve block worked, then he was right. Well, it doesn't appear to have worked to me, and I had it done yesterday. I go back to see the cardiovascular doctor on the 20th. This is all very depressing.