Has your girlfriend had an MRI scan to visualise her blood flow? It may be a good idea to consult with a neurologist about her experiences.
Also, if she is extremely tense or highly strung, the increased heart rate will also cause quickened breathing, and can also make a person feel like they want to faint. If she is suffering from anxiety or any psychological difficulties at the moment, then seeing a psychologist / psychiatrist for the correct treatment and management should then relieve her of the anxiety and tension which should result in her feeling better.
Generally, vertigo is categorised by quick spells of spinning or the sensation that the room is spinning. Lightheadedness is different from vertigo - where it feels as if you have stood up too quickly and that you may faint. This is usually vascular and should be assessed by a physician.
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