Oh the poor girl I can really sympathise, it sounds something like my first experience with edibles lol. The turn from giggles to suddenly fast heartbeat and then a wierd sensation of having all my insides being sucked down towards my feet. It got wierder still over time which I guess is one of the main differences between eating this stuff and smoking - you can stop smoking and regulate it to some extent but if you've eaten something there's not too much (besides vomiting it straight away) you can do to get off the rollercoaster.
Like you I was wondering if I should try growing a sativa or 2. A friend has some of Greenhouse's Amnesia Haze.. Have you got any thoughts on what sativa you might try?