I went through a phase that lasted a few months. Randomly, I would feel sick after eating. Most often, it was overwhelming fatigue… a few times I laid on the floor of my cubicle for 20 minutes to get through it. Then it would pass and I could go about my day.
This hasn’t happened in quite some time, so I’m not sure why it was happening. I kept thinking it had something to do with the vagus nerve reacting to the contents in my stomach and sending an inaccurate message to the rest of the body to shut down.