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Caffeine is a vaso-constrictor, it constricts your blood vessels. It also increases your heart rate and your blood pressure. If you were to over use caffeine and cause these physiological changes to take place with the result being a return of your initial problem, I would think that some type of physical damage has occurred. I would most defiantly have this checked out by another doc.
Are you sure it was Nitrous Oxide? I was under the impression that it was relatively benign.
Of course, I could be totally wrong.