A few days ago i suddenly started feeling very full after eating less than half my normal pottion size. today still, i cannot eat my normal portion size during lunch or dinner. i do not have any pain or nausea. i just feel really full.

Common things are...: Common things are common! That means one should look for common reasons for the symptoms. For feeling full shortly into a meal, there are many possible reasons. The primary care doctor can evaluate for the common causes. Then, a gastro-intestinal specialist can do added testing if needed. Gastritis, gallbladder or gallstone issues, liver disorders, anxiety, depression, etc., are possible causes.