Kava is an MAO-B inhibitor according to some guy from another forum. MAO-B regulates Dopamine and Phenylathylamine according to him. Don't know if its true and I'm not going to research it for you.
Then what was the point of that post? I mean, if you're not even going to provide legitimate information? lol.
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What works for one person, might not work for you. Or even worse, make your social anxiety even worse. While I do agree that low doses of stimulants & opiates do work really well, I wouldn't recommend either of them, since they can both be habit forming.
If you can get a legitimate prescription, I would almost suggest some sort of benzo, in a low dose. Xannax or Klonopin would probably work well for you. But hell, who knows. Maybe you should try and find the root cause of the problems you're having? Just talk to your doctor about your situation, and hear him out on his opinions on what could potentially be best for your treatment.
Either way, good luck. I hope you can get everything figured out.
Edit:
I drink a bit, but I try to avoid it since its so bad for the body.
If you're worried about substances being bad for your body, why are you looking into different drugs that could potentially help? I mean, there's always at least
some damage done by whatever drug you're consuming. Whether it's a noticeable amount or not. I'm not trying to come across as an asshole or anything, that comment just doesn't make much sense to me at all...