Haha
@Juicewrldfan I think by now you should know none of your Bluelight homeboys are ever going to judge you. We've got your back no matter what you decide to do. This doesn't mean we don't feel for you. We want you to be happy. Many of us have experienced the misery and hopelessness of the binge/regret cycle. This is why we care. It is also why we feel empathy for you brother. So, pleas don't ever feel like you're gonna be judged. If anyone here does judge you, then they really aren't one of us anyway, so fuck 'em.
Compared to a lot of the more commonly known (and studied) drugs, like say, Heroin, there is a dearth of information concerning Kava and its constituent active compounds, the Kavalactones. We definitely have some information, but nothing like we have for stuff like Heroin.
I have taken Kava and Amphetamines together and never experienced anything negative, though that is not really saying much. I'll say, in the big picture, I find it unlikely that Kava would be the thing that does you in. It's a pretty mild substance. Stuff like Serotonin Syndrome can always happen. I don't think that the combination you're describing is any more likely to cause a serious issue like Serotonin Syndrome than anything else.