Our expert says:
I would suggest a very strong possibility that it is BP related, since it does occur in certain positions, and the symptom that you develop when you stand up is a tell-tale. Of course, this does not rule out low blood sugar, and if you just eat a small meal, like a sandwhich, maybe some fruit about 30 to 60 minutes before your class, and the problems go away, then it's fixed! However, if it is a low BP issue, then you can consider adding more salt to your food (the natural solution) or you can see a doctor about medication. If the problem is severe enough, then this may be worthwhile. Hopefully some food will help though
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