Foxy Momma

Has anyone out there developed diabetes AFTER surgery? I am 6 years out and not overweight but feel sick after I eat high carb meals. Usually things that contain bread or cereal and milk or yogurt. I feel like I’m in a sugar coma- very sleepy, short of breath, nauseous etc usually 15 minutes after I eat. I started testing my blood sugar and found my sugar was high when I am feeling this way- like well over 200. As I started testing throughout the day, I also see I am having very large deviations from highs to lows. Is anyone else unable to tolerate these foods and has anyone else develop diabetes after surgery when you are not overweight?