I've been doing lot's of research on the internet since posting last and think I now have an answer to my own question. I believe what I described is a type of Essential Tremor although not nearly as serious or as life altering as many of you may be dealing with or have been experiencing it. Thinking back now, I can remember many other times when tremor has been a problem for me, but did not recognize it for what it was at the time, because it was not as dramatic a presentation as it was in a medical situation when I literally shook so bad that it caused the doctor to have to stop to sedate me. There have been more subtle situations: I am thinking of the voice weakness when stressed or anxious and shakiness with nervousness [like chills] at a job interview or during a serious talk or presentation. It has affected me socially, too. I know that when I am getting tired, especially at night at social gatherings, I start having trouble talking and my coordination gets bad--- it is time to get quiet and just listen, and if I can, to go home early. This was particularly a problem when I was young and dating. Over the years I have learned how to hide it better. Perhaps some of you can relate.