Nausea

I'm having 24/7 nausea, but the only time I'm not sick is after I eat and when I'm full after eating. Unfortunately the only food I can tolerate are carbs(pizza, bread, oatmeal, peanut butter, fruit, sugary foods, cookies, etc) and almost all healthy food disgusts me right now! I don't want to gain an unhealthy amount of weight, but at this rate I might! Anyone experiencing anything similar?