That doesn't sound like weed to me man...licking it and it had a chemical taste to it...whenever i have eaten a little leaf of weed it tasted...hmmm...cant remember the taste because i was faded haha...but i remember it was good . Sounds like you either had an anxiety attack Or (and this is very unlikely) it was laced. Dealers hardly EVER lace their weed and sell it though...its a waste of money on there part.