Hi Suzane,
You are not alone with this problem. Many years ago a doctor gave me valium...can't even remember why...but I do remember that I was so "wired" with even a small amount. This was my first indication that I must use exterme caution with medicine selections.
While I have no studies/data showing why some people react this way, I did find some info from a company that does DNA Drug Reaction Testing:
http://www.healthanddna.com/drugreactiontest.html
Hope this will provide some information for you.
Carly
PS A cup of coffee makes me doze...NO
to red wine which brings instant tachycardia!