Why when i eat a normal sized meal, do i feel really sick, over stuffed and tire!

Why when i eat a normal sized meal, do i feel really sick, over stuffed and tired?...sometimes dizzy?

let me know, should i eat less?

Sounds like a case of hyoglycemia to me. I am not diagnosing you, I am just going by my own experience. Are you eating breads, potatoes, rice etc with your meals. Stop ! Take away anything that the body "reads" as glucose. This can be juice, bread, cereal, candy, potatoes,rice, doughnuts, ice cream etc. All of these and similar others can contribute to your symptoms. If things improve you should point this out to your doctor.

Now, eat meals rich in non-starchy fruits and vegetables like strawberries, cantalope, romaine lettuce, zuchini, etc. Make sure that you also eat some form of protein, chicken, shrimp, eggs, cheeses,steak etc. No desserts or anything like that. Eat that way for a day and see how you feel the next day, continuing that pattern.