Every time i worry about something for feel anxious my head starts buzzing and i get really dizzy. why does anxiety do this?

When someone has increased stress, there’s a rush of adrenaline. Some people react by tensing up their muscles, specifically the neck & shoulder muscles. Spasm of these muscles can lead to the symptoms that are described. Heating pad & therapeutic massage to area can be helpful. Stress increases bruxism, which can lead to TMJ problems that can have similar symptoms. Heat, NSAIDs, & mouth guard.