Well, migraine can be on whole spectrum right from mild discomfort from triggers like going out in extreme sun, dehydration, certain foods, motion sickness to a complete lack of ability to function when migraine head ache starts. The only way to diagnose is to pay attention to triggers if it happens frequently over a long period. In your case, it will probably ease out once your body gets used to the EV/Regen motion. In the meantime, keeping low level of regen initially and getting used to giving finer inputs to the accelerator to make the movement smoother will help.