I agree with some of the other posters, it's more likely a blood sugar or dehydration thing. A lot of people have experienced this, and you may or may not have without the ganja as well. If you feel like this again, drink some real fruit juice, or eat something like fruit and protien. Some strands of pot lower your blood pressure so if your blood pressure was a bit low to begin with that could have been the problem. I wouldn't worry about it, unless it becomes a habbit. Also keep in mind that where as most people take pride in their product, some people will add other things, so always be careful
you take much acid or mushrooms, you might be having a flashback or somting, I started getting flashbacks kinda like that but it melted into what me-thinks may be a prmanent fry.