Everytime I eat a meal about 10 minutes after, I feel nauseas for at least 45 minuets, what could be causing this and how could I treat it?

Gastritis or GERD. Assuming you're not pregnant, nausea is usually caused by upper GI problems like gastritis or acid reflux disease. You can try modifying your diet, using ginger tea or taking otc meds for a few days. If symptoms persist, see your healthcare provider for proper evaluation and treatment.