Re: Fear of fainting/passing out?
If its any reassurance a close relative of mine had an actual physical fainting illness and could collapse multiple times a week. They had unusual side effects too and so could not get moving for up to an hour afterwards. It went on for 18 months.
Despite all that the only side effects were bruises from hitting the ground! In the fainting illnesses that's usually the most serious risk.
If you are getting constant odd feelings re fainting or blood sugar it would make sense to bring it up with the GP. Some of our meds (if you are on any) do make that worse, or give us problems.
Superficially your symptoms suggest that you ought to be checked for blood sugar issues. You can get a condition where the body overreacts to the sugar from a meal and so your blood sugar falls low an hour to two afterwards (instead of rising and staying steady), leaving you hungry & almost desperate for food. This sounds a bit similar. Its worth pursuing that with your GP.
Equally though it may just be a side effect of the anxiety (using up energy) combined with a phobia of fainting.
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Kevin, Southend-on-Sea, Essex, UK
Probably GAD & Phobias. Anxiety and renewed Depression medicated (Venlafaxine). Trying to improve.