Beach,Androsine mentioned breathing, please let me go into a little more detail. When you first start to feel your nervous stomach, its best to change your breathing right away.First, inhale through your nose s-l-o-w-l-y, filling up your bottom stomach (diaphragm) first, and then rolling up to your lungs. Hold this for 2-3 seconds. Then s-l-o-w-l-y exhale through your mouth. Just keep your focus on your breathing. The amount of time it takes to inhale should equal the time to exhale. Remember slowly, otherwise you'll hyper-ventilate (don't need to pass out as that certainly makes a memorable entrance. Humour for the situation helps!!! I know its not funny for a lot of people, but its not life threatning either). Do this for up to 60 seconds. Physically and mentally it will relax you. Actually it will send a message to brain central to turn off the release of chemical stimulants (which is Nature's way of protecting you) that are causing this feeling.Secondly, acknowledge that you're "anxious" and tell yourself that anxiety or nervousness is nothing more that being excited. That you're excited you're going to meet new and interesting people. Do you see what I'm suggesting? Replace negative thought patterns with positive, constructive thought patterns. Always use positive dialogue to talk yourself through an anxious (oops, mean excited) time.The only way to stop the "fear"( and resulting upset stomach feeling) is to experience them and then work your way through them.Most important is to understand why you experience these feelings, if as you say you are very social. Once your able to handle the feelings you do need to understand the cause.You might consider talking with a psychologist or even a very good and close friend (one you can confide in). This friend should be willing to listen and not offer suggestions. Once you've talked them out loud, the solution will become evident.Hope this helps.