I always feel nauseous and tired. it lasts all day, sometimes the nausea subsides, but i have no energy throughout the whole day. what's wrong with me?

GI problems?: I don't know what happen with you. You should go to see your doctor, have a good history and exam, get some blood work perhaps to find what is wrong. You could have gastritis/inflammation on stomach lining, could be other separate problems like initial presentation of diabetes, anemia, thryoid problems etc. The possibilities are wide with a very limited info given here. Go to see md to get checked.

Many possibilities: The first thing is to consider if you are pregnant. Nausea and fatigue are very common and non- specific symptoms so there needs to be more information to begin to sort this out. I would want to know how long have you been feeling this way and did anything change around the time it started. Have you lost weight or missed work or school because of these symptoms? Think about and see your pcp.