Does Fruit And Vegetable Diet Cause Nausea And Bloating?

I have been on a fruit and vegetable, smoothie, etc diet. It has been six days now. At about day four, I started getting nausea and bloating after food. I have upper stomach pain and bloating and today about 2 hours after lunch, I had vomiting, nausea, bloating. I can t figure out what is causing it.