Hi sunnyboy,
I had vasovagal syncope but grew out of it, as some people do. I somtimes felt weak for weeks, but never discovered a cure for the weakness. Here are some things I found helpful:
-upon waking, lay in bed for a couple minutes before sitting up
-elevate your legs before getting out of bed
-don't stand up too quickly
-get enough sleep
-sodium, caffeine (moderately, of course), and Gatorade can help
-have cold water on hand for when the dizzy feeling strikes
-check your blood pressure regularly to understand which symptoms might lead to syncope
-if you think you might faint, SIT! Put your legs up, if possible. I've reclined with my legs elevated in all different locations... friends' houses, blood labs, locker rooms. Don't try to wait out the feeling.
-make sure the people you spend your day with understand; it could mean the difference between being caught on your way down and landing with a thud
-learn your triggers: standing too long, hot showers, exertion, shopping malls (something about them made me weak!), the sight of blood, etc

Lastly, if you're researching vasovagal syncope, remember that it's also referred to as neurocardiogenic syncope and neurally-mediated syncope. It can be caused by orthostatic hypotension, or a drop in blood pressure upon standing.

Good luck. Hope your holidays go smoothly.