Seriously odd lavendar kush... Thoughts?

Now i've had some different strains before, and this has been no different. I've had this stuff now for about 2 months and I'm just on my last couple grams. I decided that I would toke up a little before I went to take care of stuff at work, so I grabbed a nice bud of lavendar kush, and smoked a salad bowl. Needless to say, I was all set for my excursion . So I walk to the building a few blocks away, take care of my stuff in under 20min, and then move on to grab some grub at a restaurant. I just order chinese takeout, and usually they get it in like 10 minutes, no big.

It was at this point that I started getting kinda dizzy, standing at the entrance just chilling with my bag and coat. After about 5 minutes, I was under the impression that it had been about a half hour, and It was just sooo hot in there?! In seconds I was spinning and I had to sit down. She comes out with my food, I pay, and still dizzy, leave the restaurant.

I walked about half a block when I felt if I didn't sit down I would sick. I take a seat on one of the benches and as I stare forward, everything is getting bright, I feel light headed, and about to pass out. I think to myself "FOCUS!" and manage to come to a little, take of my coat, and just take deep breathes. After about 3 minutes, I was back to normal high elated feeling...

What the fuck was up with that shit?! Is it likely that a bud out of my large batch was laced? Has this instance happened to anyone else? Thanks for your thoughts guys. And yes, I know it's not a "trip", the herb doesn't do that, and re-examining the remaining bud, it didn't look like there was anything but THC.
-Rapture