Read my previous post.
Keep properly hydrated, and you shall have much less problems.
The problem is that you blood pressure drops when you take a deep inhale. If you already have a low bp, you will feel dizzy. This problem is especially severe, when dehydrated.
Proper hydration is a whole other thread, but just make sure you drink enough. A good rule of thumb is if your piss is clearly yellow, you ain't drinking enough.
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Simo K
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