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I found that my migraines were caused, in large part, by food. In my case, it was caffeine and foods containing nitrites (red wine, hard cheese, liver, and some others). Of course, cutting out caffeine also helped my sleep apnea. Anyway, after I finished grad school and changed my diet, my migraines cut back drastically.
Several months ago, I found that I was waking up with a migraine at least 3-4 mornings a week. (Strangely enough, I never develop one during the day -- I always get them during the night.) I was flummoxed as to why I was suddenly having an increase in my headaches, and then realized that I had resumed some of my former eating patterns. For instance, my husband and I had developed a habit of sharing a glass of wine in the evening, and I really enjoy a good red wine. So, again I've been concentrating on what I eat -- not for my weight, but for my headaches. I have started drinking white wine, and don't eat chicken livers (which I love) or Swiss cheese (which I also love) in the evening. My headaches have almost stopped altogether.
So, you might see if there's something else that's causing your headaches. Good luck to you.
I was first diagnosed with sleep apnea about 25 years ago, and had my VBG about 17 years ago. I have found, over the years, that my sleep apnea has never gone away, but has gone into remission for a time. But, then, I've never been able to lose much weight, and what I do lose always comes back. And I've never been able to tolerate wearing either a CPAP or a BiPAP machine. But I have found other things that have helped me along the way.
When I first had my surgery, after I lost about 40 pounds my sleep apnea subsided to where I didn't have apneic episodes. But it didn't go totally away, according to sleep studies. Now, who's to say what might have happened had I been able to lose more weight.
I've tried a number of different masks over the years, and different machines. But I am so claustrophobic that I can't even tolerate wearing a seat belt when I drive. During my last three sleep studies, I've had to be heavily sedated to even allow them to get me hooked up, which makes me question the validity of the testing. I tend to go more on subjective evidence to know when I'm having more trouble. I snore more, I feel less rested during the day, and have sleepy spells. I used to sleep with my head elevated, with a foam wedge, but nowadays I find that what works best for me is to keep my neck straight, sleeping on my side with two pillows so that my head doesn't drop down below my shoulders. I keep to a routine at bedtime, and have identified which foods negatively affect my sleep pattern. And, of course, keep trying to lose weight.
When I had my VBG 17 years ago, I was told that I had to be entubated while I was still awake, due to my sleep apnea. Now, that was really fun!
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So, who's to say?