Cats who eat too much or too fast can vomit food and it typically it appears in a tubular shape. The presence of a nervous stomach has never been documented in cats. These cats are vomiting for some other reason.
Place a non-edible item on your cats food. You can get your cat to eat slower by controlling how they are being fed. Although a cat vomiting up a hairball every so often is normal there are times when you may need to be concerned. Feed your cat a diet made for sensitive stomachs Reality.