From what I've read on these forums it seems that you may have smoked some sativa strain.

It appears that sativa strains create an "up" or "trippy" high, whereas indica strains create an "narcotic" or "lethargic" type high. Perhaps its simply a strain difference that your body/brain doesnt necessarily like?

But then again you may have developed an allergy (since nothing is impossible and people can be allergic to things such as water or sunlight).