Aiyoh, completely normal lah! At 14 weeks you're still in the thick of first trimester hormones, so the tiredness and that dizziness-nausea combo after eating is so common, most of my mum friends went through the exact same thing. Try eating smaller meals more frequently, make sure you're staying hydrated (serious, water does help!), and rest whenever you can lah, your body is literally building a whole human. That said, if it gets really bad or you're feeling faint regularly, best to mention it to your doctor just to be safe okay, they might check your iron or blood pressure, which is quick and gives you peace of mind. You're doing great, first-time pregnancy is scary but this is textbook stuff!