That sounds like Reactive Hypoglycemia, which is a condition where people's blood sugar drops after eating a meal high in carbs. You could try eating less carbs and see if it improves or you could visit your doctor.
Weird. This normally happens with hypoglycemia, a condition I have. You had best speak to your doctor about this.
Thanks for the precious information. After some google-ing, I really suspect that I do have hypoglycemia as I have some of its symptoms such as rapid heart rate, trembling and others. To be exact, after consuming food my blood sugar level is around 5 to 5.5 only but when my stomach is empty early in the morning, my blood sugar level is around 7 to 8. I have not consult a doctor yet but I am under going some self control on sugar level as 7-8 is consider diabetic sugar level.
Sounds like a good idea, Eric. Only it isn't only sugar you need to control it is all carbohydrates; cut down on things like bread, rice, cereal, pasta and potatoes and eliminate sugar. Reactive glycemia, if that is what you have occurs after high carb meals.