Oxygen for migraines?

DEAR DR. GOTT: Many, MANY years ago, probably the 4th year in my career as a flight attendant, I was on a cross-country overnight flight. All was quiet and most of my passengers were asleep except one. I watched as he tried to find a comfortable position, fidgeted around and finally ended up bent over with his head in his hands. I finally asked what I could do to make him feel better. “Nothing”, he said. When asked if he felt like he was going to pass out, he just nodded. I got an ammonia inhalant, popped it, and waved it under his nose, then put it in his hand. I returned to the buffet area. A few minutes later, he was standing by me with a bewildered look on his face. “How did you know what to do”, he asked. When explaining I just thought he looked dizzy, he indicated he’d had migraine headaches forever and this was the first time something had completely stopped one…just like THAT! We were both amazed and I’ve always wanted to check it out. I’ve waited much too long to ask you about it. Maybe it has something to do with enlarging blood vessels. So, what happened?
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