hangover --why?

[willp58]

The other nite I had 3 drinking glasses of cheap red wine. It was "semi-dry" and very fruity and when opened the first time, was a little foamy.
3 glasses is quite a bit I know but I've had that much before with no hangover. This time I had a dry-mouth, dull headache hangover.
Is there some additive that did this? Or is it just that it was cheap stuff .. (10 bux/gal).