This has happened only twice in my life. Once about a year ago, and another time-about 2 hours ago and I am still feeling the effect of it. During a very high stress period, all of a sudden I got very sudden and sharp pain in my stomach that would not go away. As a result of so much pain, I felt nauseous, weak, started sweating profusely and was shaky. The bad stomach pain lasted about half an hour, then subsided, but still feel the weakness and shakiness. Has anyone ever experienced this due to stress? I have experienced panic attacks several times, but this feeling only twice. It's worrying me, and I'm not the type who runs to the doctor.