Why for the last week, week and a half, i become nauseous and vomit about 2 hours after eating a meal? there is no pain. i don't feel hungry most of the time?

There are many possibilities for these symptoms ranging from gastroparesis to peptic ulcer disease. The only way to have this diagnosed is to see a doctor. You may need testing from a GI doctor to have this diagnosed. Good luck!

There is not enough information here to make a diagnosis as to why you’re having this nausea and vomiting. You should have a history and physical from a Dr. to begin the process of sorting this out. I would see your primary care doctor or a gastroenterologist if the symptoms persist.