Totally normal for anxiety.
Anxiety does not necessarily need one to feel anxious right at that moment - it's about subtle cues the brain picks up on that make it believe there is some kind of threat. The sympathetic nervous system then takes the lead from there. Random twitching, tingling, breathing issues, shortness of breathe, pre syncope, globus, hot flashes, clamminess, etc. etc. all anxiety. The brain/body is on extra duty.