Carbohydrate Intolerance?

Has anyone ever experienced or heard of carbohydrate intolerance? When I take very little carbs or have a carb free meal I feel good but when I eat 20g or more I feel very tired very quickly. I thought carbs gave you energy??? I just feel I don't want to eat carbs at all. Any advice?

To be honest, I get the opposite responses usually. Carb frees are hard work for my energy levels.

A brief google search suggests a possible link to celiac disease. Have you been tested for this?
Some times docs do a celiac test as part of the routine 3 or 6 monthly blood checks, but not all.
Maybe worth having a chat with your team if not.

Best wishes.