Feel sick after smoking weed, why?

I've been smoking weed for about 2 years now, and I've always handled it well. Recently though, whenever I smoke even a little bit (anywhere from up to 2 hits, bong mostly), my head starts spinning, I get super tired, and I feel like throwing up, sometimes I do end up vomiting. I don't drink alcohol so I'm always sober when I'm getting high. And again, I never used to get this feeling when smoking pot, and none of my buddies get it. Any explanations?

- Please refrain from "quit doin' drugs you idiot stoner kid", "lololololol LIGHTWEIGHT", etc.
I smoke about once a week, and most times my weed comes from the same person.
 
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