If kava tea works, then your problem is very slight, because there's not much kava in it. If you want an appropriate amount of kava, Eclectic Institute, Herb Pharm, Gaia all make kava in various forms, tinctures and pills, standardized and not. Remember, if it tastes good, there's very little kava in it, it tastes horrible.
As for the Canada ban, it's kind of banned in the US, too.