Wow, finally someone who has the same thing happen to them!! It is definitely a symptom of social anxiety. What you're describing is muscle tension (at least I think it is from all of the research I've done on it). For awhile I was so worried that I had a tic or something because everytime I would try to eat in front of people, my neck would get so tight and my arms could barely move and then they'd like shudder or something. It's really strange, isn't it? The second I have a glass of wine, the symptoms completely go away. And then once the symptom happens, you're afraid it will happen each and every time that you sit down to eat with someone, so it's in your mind when you do and then it happens! It's a vicious cycle. Try to stay focused on the people and conversation around you - use the onion theory and confirm to yourself, "So what if my arms shudder? So what if I look nervous or wierd? What are they going to do to me?" I know it seems agonizing, but in reality, it's not that big of a deal. Those people, if they notice, will probably get in their cars, say to their spouse, "Did you see that guy shudder when he would eat?" Then they'd move on to something else and never think of it again. And that's the WORSE case scenario. Hope this helps and I hope that you keep a so what attitude about this symptom.