Nuts. A lack of protein can make nausea feel even worse, so look to protein-packed foods, such as nuts — even peanut butter, as long as you're not allergic — that are easy to digest. They'll quickly replenish your depleted energy and help keep your nausea at bay.
Many people with IBS can enjoy popcorn, as it's a low FODMAP food and a great source of fiber. However, if you have symptoms triggered by eating insoluble fiber, such as gas and bloating, you may want to limit or avoid popcorn.