Why does my face heat up sometimes after eating? get dizzy when that happens. need to step into cold area to cool down. can take some time to achieve

Autonomic reflex: The parasympathetic nervous system controls "rest and digest" reflexes. While sympathetic nerve firing tends to be synchronized (fast heart rate-->fast breathing-->peripheral vasoconstriction), parasympathetic firing tends to be more discrete, each organ controlled separately. However, gut motility can sometimes lead to peripheral vasodilation = facial flushing, lightheadedness and feeling hot.