What Causes Upset Stomach, Sweating And Tingling Sensation All Over Body?

I've been experiencing symptoms over the past 6 month or so that are becoming more frequent and more intense. It started last summer with what I thought was simply an upset stomach so off to the bathroom I went. I almost immediately felt nautious, weak and it felt like by body purged everything it had in it. I did not vomit but could have very easily. I was not constipated, I usually have 1-2 bowel movements per day. These episodes came about every 3 weeks, then every couple of weeks, now it's weekly. The symptoms today were more intense. I had full body sweat, felt disconnected from my body, tingling arms, feet and cramped fingers. Took much longer to feel normal again. Eventually after about 30 minutes, I started being able to move my fingers again and the tingling slowly subsided. I have been feeling ill for the past couple of days...typical flu symptoms. I am drinking plenty of water and eating as regularly as tolerable. Should I be concerned? Thank you....Nicole