Sounds like you may have low blood sugar. You may want to be tested for hyperglycemia. If so, this can be dangerous. If it goes away when you eat something chances are low blood sugar levels. I hope this helps, don't wait to get checked.
I Have Trembling Inside My Body And It Makes Me Feel Like Vomiting. What Does It Mean? Can You Help?
There could be several things going on here, a flu, a food poisoning, intestinal problems, you should really go to the hospital as soon as you can to be checked out. Hope this helps, good luck to you.