Hi and welcome to the forum! I am glad that I can help you.
You would like to know the cause of a queasy feeling after eating.
Certain individuals may experience nausea after eating due to an excessive amount of food taken with the meal. Nausea may indicate bowel bacterial food or water-related infection, which can be accompanied with vomiting and diarrhea. In certain cases nausea and vomiting may be related to dizziness due to an ear infection. Sometimes tea that is used in order for individuals to lose weight may cause nausea.
Given the symptoms that you described, you may or may not be experiencing any medical condition. You may consider having a blood count to rule out any infection. Avoid food intake if you notice nausea or intolerance after eating. You may consider seeing an ENT-specialist if you experience pain in or behind your ears or experience dizziness.
Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor for further advice and information about diagnosis and treatment options.