Hi there. Your fullness of head feeling should not be taken lightly. It could be a hypertensive episode, a transient ischemic attack, hypoglycemia, dizziness due to possible anemia, stress, anxiety attack or an unruptured aneurysm. So this needs immediate medical attention by a neurologist last something serious is missed out.
Hope this helps. Take care and regards.
yeah u shud see a doctor although it sounds like anxiety to me. ive had it when watchin scary or warped films. sounds like a mini black out so maybe just see if doctor can give u blood tests and blood pressure checks just to check u over. x