 Find a doctor who does functional medicine or integrative medicine so they can analyze it, not just from the lab normals, which are usually based on sick people, but where the optimal range is and what they can do for you. This sounds like a classical blood sugar problem or a fat or a digestive problem, maybe in the area of carbohydrate or fat. So you might want to start with maybe going to the health food store and just getting a digestive enzyme and taking a digestive enzyme just as you start the meal.